Season 1 · Episode 4
A chemical shift in the body that changed the shape of institutions.
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About This Episode
Exchange Alley, London. 1698. A broker named John Castaing begins publishing a twice-weekly list of stock and commodity prices from Jonathan's Coffee House — a cramped, low-ceilinged room at the end of a passage barely wide enough for two people to pass each other. He calls it The Course of the Exchange and Other Things. It's a piece of paper. It's also the moment that conversation becomes a market.
The London Stock Exchange traces its direct lineage to that room. So does Lloyd's of London, which began as a coffeehouse near the Thames where merchants underwrote shipping risks over coffee. So does the Royal Society, which grew from a group of scientists meeting in Oxford coffeehouses in the 1650s. So do the Royal Society of Arts, Sotheby's, Christie's, and the modern newspaper. Every one of them has a coffeehouse in its origin story.
This episode asks why — and finds the answer not in the social history of the coffeehouse, though that history is real and important, but in the pharmacology of what people were drinking inside it.
Before coffee arrived in England, the standard morning drink was small beer: weak ale, typically under 3% ABV, consumed not for intoxication but because boiled water was safer than standing water in a 17th-century city. A CNS depressant. All morning. A persistent, gentle brake on the speed and clarity of thought before the working day had properly begun. Then coffee arrived — and that brake came off. Caffeine blocks adenosine receptors, prevents the brain's sleep pressure signal from completing its circuit, and releases dopamine and norepinephrine. The people inside those coffeehouses weren't simply in a new kind of room. They were having a new kind of morning.
The episode also traces the drink's journey from the Ethiopian highlands through Yemen and the Ottoman world into Europe — and the near-prohibition it faced in nearly every culture it touched. Mecca, 1511. Istanbul, 1633. London, 1675. Prussia, 1777. Every ruler who tried to ban it was afraid of the same thing: not the drink, but the room.
Every ban failed.
What's in the Glass
This episode gets two drinks. One is where coffee and the cocktail world collide. The other is what the people at Jonathan's actually had.
London, 1983. A young model walks into the Soho Brasserie and asks the bartender — Dick Bradsell, one of the most influential bartenders of the 20th century — for something to wake her up and mess her up. Bradsell reaches for the espresso machine sitting on the bar next to him, pulls a shot, and builds what becomes the Espresso Martini. The coffeehouse, three centuries later, meeting the cocktail bar.
Recipe
Combine all ingredients in a shaker with ice. Shake hard for 10–12 seconds — the vigorous shake is what creates the foam. Double strain into a chilled coupe. The three coffee beans on top are traditional; they represent health, wealth, and happiness in Italian coffeehouse culture.
A note on the espresso: Fresh is non-negotiable. The crema on a just-pulled shot is what creates the foam on the finished drink. If you don't have an espresso machine, a Moka pot pulled strong will work. Cold brew concentrate will not.
Zero-Proof Parallel
The episode traces coffee from the Ethiopian highlands — the Kaffa region, where coffee plants originated — to Exchange Alley, London. This bring it full circle.
The recommendation: Intelligentsia Coffee Ethiopia single origin — the Alaka Washed or Kirite Washed, both sourced from the METAD operation in Guji, Oromia. METAD operates Africa's first Coffee Quality Institute certified lab and works with thousands of smallholder farmers across the Guji region. Intelligentsia has been sourcing from Ethiopia since the mid-1990s and is one of the pioneers of direct trade in the specialty coffee industry. Available online at intelligentsia.com and at specialty retailers nationwide.
Method: Pour-over — Chemex, V60, or Kalita Wave. Start with a 1:18 coffee-to-water ratio. Grind medium-fine. Use water just off the boil, around 200°F. Bloom the grounds for 30 seconds with twice their weight in water, then pour in steady, slow circles until you reach your target weight. Total brew time: 3 to 4 minutes.
A note on the method: The episode is about what caffeine does to the brain and what happened when people had access to it for the first time. Pour-over slows the process down enough to pay attention to what you're making. The floral, fruit-forward character of an Ethiopian washed coffee — the clarity of it, the brightness — is what you're after. This is the drink that changed the world. It deserves the long method.
Zero-proof parallel: Combine 2 oz strong cold brew concentrate with ½ oz coffee liqueur alternative (Lyre's Coffee Originale works well) and ¼ oz simple syrup. Shake hard over ice, double strain into a chilled coupe. The foam won't develop the same way without the espresso crema — accept this and move on. The drink is still excellent.
Research & Further Reading
Sources Cited
If You Want to Go Deeper
Primary Documents
From the Still
Things that didn't fit in the episode but are too interesting to cut.
The Kaffeeschnüffler — Frederick the Great's 400 disabled veterans hired to sniff out illegal coffee roasting in Prussian cities — are not a footnote. They are a monument to the futility of trying to legislate away a drink that people have decided they need. Frederick spent state resources on a smell-based enforcement apparatus. The coffee kept flowing. The Kaffeeschnüffler became a word in German, and it is a wonderful word.
Dick Bradsell, who created the Espresso Martini in 1983, went on to invent or popularize several other defining cocktails of the late 20th century, including the Bramble and the Treacle. He is widely considered the godfather of the modern London cocktail scene. He died in 2016. The Espresso Martini, which he reportedly had a complicated relationship with toward the end of his career — it had become so ubiquitous that it was difficult to take seriously — has outlasted the ambivalence and is now definitively a classic.
The adenosine system that caffeine hijacks is also the system that alcohol disrupts, though through a different mechanism. Alcohol enhances the effect of GABA, the brain's primary inhibitory neurotransmitter, while suppressing glutamate, its primary excitatory neurotransmitter. The net effect is similar to what adenosine buildup produces: slowed processing, reduced cognitive control, impaired working memory. Two different molecular pathways to the same general result. The coffeehouse reversed both simultaneously — replacing the morning ale with caffeine, replacing a double inhibition with a direct stimulant. The pharmacological shift was larger than either substance alone would suggest.
Exchange Alley, London. 1698.
It’s nothing more than a cramped passage, barely enough room for two people to slip past each other, squeezed between Cornhill and Lombard Street right in the City’s heart. Really, it hardly deserves the name “alley”. It’s more of a gap, unnoticed on most maps. But if you belonged to the crowd that mattered in London back then, you definitely knew about it, and you’d end up at Jonathan’s Coffee House tucked away at the far end.
Jonathan’s didn’t look like much. Low ceilings made it feel even smaller, long rough tables filled every corner, and the walls carried the heavy scent of roasted coffee battling with pipe smoke. Pay a penny, walk in, find a spot anywhere you could. That was it. Eighteen years earlier, Jonathan Miles had opened the place, and over time it became the unofficial meeting ground for a certain kind of Londoner: the buyers, the sellers, the men who saw profit and risk in stocks, commodities, futures—the ones who needed to trade information as much as they traded money. And in 1698, nobody in London exchanged information better or faster than the folks hunched over a cup inside a coffeehouse.
That year, a man named John Castaing completely changed what the room was for. John Castaing was a broker who spent long days in Jonathan’s. He started putting out a handwritten sheet that he called The Course of the Exchange and Other Things. Twice a week, he listed prices—stocks, commodities, exchange rates—anything that had changed hands or value on the floor. For the first time, somebody tried to pin down the chaos of deals in the room and make it official: black ink on paper.
It was just a single sheet, but it crossed a line. Talk turned into numbers. Chatter became a market.
If you trace a straight line from Castaing’s slippery ink in 1698, you end up with the glowing, real-time data feeds we live by today. All of it started on those battered tables in Jonathan’s. But none of this would have happened without the coffee—or without the swift, wired energy it pumped into the veins of the men inside.
And that’s where this story begins.
If you really want to figure out what was going on in Jonathan's Coffee House in 1698, you have to rewind way past the streets of London. You have to head all the way to the Ethiopian highlands, and to a story that sits on the edge of myth—maybe true, maybe not, but definitely too good to skip.
So, picture this: ninth century, maybe the tenth, maybe no century at all—pick a century, really—there’s an Ethiopian goatherd named Kaldi. He notices his goats are acting odd, prancing around with wild energy after munching on the red berries of a certain bush. These goats are basically throwing a party in the field, and Kaldi’s intrigued enough to try the berries himself. He gets a jolt. Curious, he takes them to a monastery nearby. A monk, convinced this is straight-up devilry, chucks the berries into a fire. But then—the air fills with the smell of roasting beans. The monks rake the charred berries from the ashes, grind them up, and mix them with hot water.
Supposedly, that’s the very first cup of coffee.
Now, this tale is almost certainly made up. Nobody wrote anything down until 1671, when Antoine Faustus Nairon—a Maronite scholar teaching in Rome—put the legend to paper, eight centuries after Kaldi was supposed to have lived. That's suspicious, right? There's nothing before that. Eight centuries of silence, and then suddenly a fully formed legend. That's not how history usually works.
Here’s what actually happened: Coffee plants go back to the ancient forests of Ethiopia, most likely the Kaffa region. The very word “coffee” comes from “Kaffa.” The Oromo people, who lived there, figured out these berries had a kick long before anyone thought to brew them. They’d mash the berries with fat for a quick energy snack.
Now, the first solid evidence of people roasting and brewing coffee as a drink? That’s from 15th-century Yemen. Sufi monks from the Shadhili order used it to push through long nights of prayer. The beans made their way from Ethiopia to Yemen, most likely hauled across the Red Sea by traders. The Yemeni port city of Mocha turned into the global coffee hub (hence “mocha” on the menu), and from there, the drink rode the waves of Islamic trade and pilgrimage—Mecca, Cairo, Damascus—and by 1554, it reached Constantinople.
And everywhere coffee went, someone tried to stop it. That’s part of the story, too.
Banning coffee has played out like a dark comedy in history—everywhere the drink showed up, someone tried to outlaw it, always for the same reason, always with the same outcome.
Let’s start in Mecca, 1511. Kha'ir Beg al-Mi'mar, the governor, but more specifically the market inspector in charge of public morality, spots some men drinking coffee outside a mosque late at night. Worried, he gathers a group of scholars to decide if coffee counts as an intoxicant that should be forbidden by Islamic law. They dig up some medical testimony and say yes. So, he bans coffee, orders it confiscated, burned in public, and punishes anyone caught drinking or selling it.
That ban doesn’t last long. Only weeks later, the Sultan of Cairo—Kha'ir Beg’s boss and a coffee drinker himself—steps in and tells him to drop it. Kha'ir Beg eventually loses power and is executed, though not for his coffee crusade.
Here’s what really matters: it wasn’t coffee itself that scared him. It was the gathering—the coffeehouses that became hubs for late-night conversations, politics, news, and ideas the authorities hadn’t signed off on. Coffee was just an excuse. The real threat lay in the room.
Fast forward to Istanbul in 1633. Sultan Murad IV, infamous as “the Cruel,” gets it in his head that coffeehouses are breeding grounds for rebellion. He bans coffee, tobacco, and alcohol. He doesn’t stop there—he makes drinking coffee a capital offense. According to multiple accounts, Murad disguised himself and prowled the city to catch offenders. First offense: a beating. Second offense: the culprit would be sewn into a leather bag and tossed into the Bosporus. Some stories even claim Murad personally decapitated coffee drinkers. Even if those tales are exaggerated, the message is clear. He didn’t want people thinking critically and talking freely in his city.
Murad died in 1640—ironically, from cirrhosis, drinking himself to death while banning alcohol. History gets poetic sometimes. The very next day, Istanbul’s coffeehouses reopened.
London, December 29, 1675. King Charles II proclaims all coffeehouses in England will close by January 10, 1676\. His complaint: coffeehouses let “idle and disaffected persons” gather and criticize the government, spreading “false, malicious and scandalous reports.” Charles hated “coffee house politicians”—ordinary people discussing equality and his policies, basically doing what powerful people despise. Public outrage was immediate. Just eleven days later, before his ban could even start, Charles gave up. January 8, 1676: the king of England, defeated by coffee drinkers.
Prussia, 1777. Frederick the Great—soldier, ruler, genius—publishes a manifesto attacking coffee. He says, “It is disgusting to notice the increase in the quantity of coffee used by my subjects. My people must drink beer. His Majesty was brought up on beer, and so were his ancestors, and his officers." Frederick’s complaints are partly economic—he believes 700,000 thalers are leaving Prussia every year for coffee beans—and partly about identity. Beer is Prussian. Coffee is not. The manifesto fails, so Frederick creates a state monopoly on coffee roasting. That fails too. He hires about 400 disabled veterans from the Seven Years’ War to sniff out illegal coffee roasters in the cities—the Kaffeeschnüffler, or coffee sniffers. People mock them, ignore them, and keep roasting coffee. By 1787, a year after Frederick’s death, the restrictions are repealed.
Mecca, Istanbul, London, Prussia—the pattern repeats. The rulers weren’t really afraid of coffee. They feared the coffeehouse: the physical space where people gathered, awake and sober, thinking and talking themselves into conclusions no one in power wanted them to reach. Every ban crumbled. No law can erase a meeting place for clear, open conversation. The need for those rooms runs deeper than any ruler’s decree.
London’s very first coffeehouse popped up in 1652. Pasqua Rosée, who’d been born somewhere in the Levant, worked as a servant for Daniel Edwards—a merchant knee-deep in the coffee trade from his years in Smyrna. Edwards had brought Rosée back to England, and this tiny decision helped change city life. Here’s why: Edwards’s love of coffee wasn’t just a private habit. Friends, associates, curious acquaintances—they all kept turning up at his house, hungry for this strange new drink, until the crowds threatened to swamp his home life. So Edwards took the hint and set up Rosée in business. The “café” was basically a shed wedged against St Michael’s Church, in a crooked little alley near the Royal Exchange. Demand wasn’t a problem—within a year or two, Rosée was serving up to 600 dishes of coffee every day.
London didn’t waste any time catching on. Eleven years after that makeshift shop, there were at least 82 coffeehouses packed into the City. By 1700, people guessed there were between 1,000 and 2,000 scattered across London (depending on whether you counted the illegal ones). For one penny, you walked in, read every paper in the place, and sat anywhere—next to a lord, a cobbler, a scientist, whoever. Nobody minded what you were. The coffeehouse became the “penny university”—the price of a drink got you admission to the whole spectrum of London society.
Inside, something genuinely new happened. Newspapers, still fresh inventions, landed on the coffeehouse tables and sometimes got read aloud. Runners charged in with news from ships, courts, or Parliament. Proprietors posted bulletins on the walls. Gossip, politics, business tips—they all shot around the room in a wild, unscripted, totally public conversation. If you had a penny, you had a seat at the table.
And out of all those caffeinated conversations, real institutions grew.
Take Jonathan’s Coffee House—its early crowd included brokers who’d been booted from the Royal Exchange for being a bit too unruly. They set up shop at Jonathan’s instead. In 1698, John Castaing began publishing The Course of the Exchange—keeping systematic records of stock and commodity prices. In 1773, about 150 brokers pooled their money, bought a building, and launched the Stock Exchange. The London Stock Exchange traces its birth straight back to that alley coffeehouse.
Or look at Edward Lloyd’s place, opened near the Thames in 1688. With the river just outside, his main business came from merchants, ship captains, and owners. Lloyd installed a pulpit to announce shipping news. He hired runners to scour the docks. Wealthy men gathered there and started underwriting risks on ships—so the very idea of insurance grew from these coffeehouse meetings. By 1774, the regulars organized as Lloyd’s of London. Lloyd’s List, which started as a simple newsletter from Lloyd’s, still publishes today.
Oxford wasn’t immune. In the 1650s, the city’s coffeehouses drew sharp minds: Christopher Wren, Robert Hooke, Robert Boyle, William Petty, and others. Their “Oxford Coffee Club” evolved into the Royal Society of London—the oldest scientific institution in the English-speaking world.
On March 22, 1754, William Shipley and ten friends gathered at Rawthmell’s Coffee House in Covent Garden and created what became the Royal Society of Arts.
Sotheby’s? That began as a modest coffeehouse auction. Christie’s too. Coffeehouses doubled as distribution points for newspapers and the source of much of their content. The insurance industry, modern stock markets, Britain’s scientific bastions, auction houses, the press—they all trace their DNA to the coffeehouse.
The insurance industry, the stock market, the scientific establishment, the auction house, the press. All of it from the same rooms, the same drink, the same penny. That's not a coincidence. The reason for all of it is sitting in your bloodstream right now, and it starts with a chemical your brain has been producing all day.
You see, all day, your brain churns out adenosine, a chemical that piles up as a byproduct when your neurons burn energy. Every time you think, solve a problem, or stress out, your brain spends ATP—adenosine triphosphate—fueling the work. After ATP gets used, adenosine builds up. It clings to receptors in the parts of the brain that keep you alert, gradually dialing everything down. Sleep scientists call this growing urge to sleep “sleep pressure.” Stay awake long enough, and that adenosine haze thickens. It eventually feels impossible to keep your eyes open. The only effective way to sweep this stuff out: sleep.
Then there’s caffeine. Its shape is so close to adenosine that it can sneak into those same receptors. Caffeine slides in, but it’s a fake key. It fits the lock, but it won’t open the door. Instead, it jams the site, blocking adenosine from sending its “you’re tired” message. Your brain’s sleep pressure circuit stalls out.
That’s just the start. With adenosine blocked, dopamine moves more freely. Norepinephrine, which cranks up alertness and arousal, ramps up. Your brain gets more acetylcholine, a neurotransmitter needed for paying attention. Think sharper, move faster, focus harder. Suddenly, you’re awake and switched on in a way you simply weren’t twenty minutes earlier.
Caffeine lingers in your system. On average, its half-life—the time it takes your body to clear half of it—is about five hours. But this window varies wildly, from ninety minutes to nearly ten hours, mostly thanks to genetics and age. Drink coffee at 8 a.m.? You’ll still have half its kick left by 1 p.m. No wonder the modern workday hums along on it.
Here’s the catch: regular caffeine drinkers develop tolerance. Your brain, confronted with constant interference at its adenosine receptors, adapts. It builds more receptors to restore the balance. If you rely on coffee every morning, you’re not gaining an edge over your well-rested self—you’re just hauling yourself back to normal after a night of withdrawal. Your first cup doesn’t make you superhuman; it only brings you back to baseline, undoing the deficit that dependence created. Basically, caffeine’s gift is just returning what it stole.
But in early modern Europe, coffee was new—no one had tolerance back then. Their brains hadn’t gone through cycles of withdrawal and adaptation. When coffee arrived, it was a true boost. They weren’t just getting back to normal—they were supercharging their minds for the first time.
Contrast this with the morning ritual that came before coffee: small beer. In 17th-century England, folks drank mild ale for breakfast—usually less than 3% alcohol. People didn’t drink it for a buzz. They needed something that wouldn’t poison them; water was dangerous, loaded with disease. The solution? Beer, boiled during brewing and safe to drink, with a few calories thrown in.
But alcohol, even a little, dulls the brain. Low doses slow processing speed, loosen cognitive control, and shrink working memory—maybe not in dramatic fashion, but subtly and persistently, morning after morning. Gentle, almost unnoticeable, but always there. Before people even got to work, their minds were running with the brakes on.
Caffeine changed all that. Alcohol depresses the nervous system, slowing thought. Caffeine does the opposite—activates, sharpens, quickens. The switch from ale to coffee wasn’t just switching drinks. It was a radical shift in biology, a reversal of gears. European society didn’t just make a new dietary choice; it made a pharmacological leap. And coffeehouses—they were designed to bring all these newly alert, energetic brains together, with no agenda but to talk, share ideas, and see what happened next.
So what really went on in those coffeehouses? Historians usually focus on the social transformation: coffeehouses opened up a new kind of public space, leveling out the usual hierarchies for a while, letting information flow, and mixing ideas across class and profession. All true. These social changes mattered. But if you ignore what people were actually drinking, you’re missing a big piece of the story.
Before coffee arrived, mornings in much of Europe looked very different. People weren’t stumbling around drunk—small beer had too little alcohol for that—but they did start their days with a depressant in their blood. That slowed them down. It dimmed ideas, relaxed the guardrails on thought, and made it harder for fresh ways of thinking, new institutions, or innovative approaches to economic life to take root.
Then came coffee—and everything flipped. Coffeehouses didn’t just offer a new beverage; they designed an environment perfect for what caffeine does best. People swapped information quickly, debated intensely, and hammered out complicated deals with strangers. These were precisely the kinds of mental activities that alcohol dulled and caffeine sharpened.
It wasn’t that Lloyd’s underwriters were inherently brighter than the men who’d spent their mornings in taverns, or that the Royal Society fellows outclassed earlier scholars in raw intellect. The difference was alertness, every morning, day after day. These rooms filled with wide-awake minds, suddenly able to access more information at once than ever before. Multiply that by thousands of people over decades and you start seeing just how much it changed.
Of course, I’m not saying caffeine single-handedly caused the Enlightenment. Plenty of forces came together: the printing press, the Protestant Reformation, scientific advances, global trade, revolution—there’s no single thread. But pharmacology played its part, and some contemporaries understood that.
Frederick the Great, for instance, saw what was at stake. His 1777 manifesto defending beer over coffee wasn’t just about protecting local brewers or Prussian culture—it was also about the kind of thinking he wanted his citizens to do. He sensed what switching from beer to coffee meant. He wanted to preserve the status quo, to leave that brake in place. He even sent out 400 inspectors to sniff out illegal coffee roasters in Prussian towns—no luck. Coffee still flowed. Conversations sparked. New ideas followed.
If you want the whole story of the coffeehouse, you can’t just look at the room or the debates. You need to pay attention to what was in the cup.
The coffeehouse produced a lot of extraordinary things. It also produced some that weren’t.
Lloyd’s of London played a central role in insuring the Atlantic slave trade. Between 1640 and the early 1800s, British traders shipped around 3.2 million enslaved Africans to the Americas. Lloyd’s has openly admitted—its market stood at the heart of insuring this industry, covering ships, their cargo, and even people treated as cargo. The space that birthed the modern insurance market also built the financial backbone for one of history’s most brutal, systematic crimes. These stories aren’t separate; they unfold in the same place, fueled by the same values, during the same decades. That old coffeehouse brought forth Enlightenment institutions, but it also gave rise to the systems that supported slavery.
Penny universities weren’t for everyone. Women couldn’t get in—not because laws kept them out, but because social rules were fierce and unyielding. In 1674, someone published a pamphlet called "The Women's Petition Against Coffee." It’s angry, blunt, and packed with sarcasm. The author complains that coffee has turned England’s men into chatterboxes—powerless, distracted, nothing like good companions. The petition actually demands that men under sixty be banned from drinking coffee, calling it “abominable heathenish liquor.”
Clearly, nobody expected Parliament to act on this. The pamphlet was part joke, but also serious. At its core, it shows just how important coffeehouses had become. People cared enough about exclusion that they turned it into satire. Half the country—every single woman—was locked out while ideas and debates shaped the Enlightenment inside. The penny university charged its entry fee, but the real cost was paid by everyone it left out.
What lasts, beyond every trend and shift, is the coffeehouse itself. A space in between, neither home nor work, where people gather. You walk in, strangers all around, everyone holding a cup. No one expects anything except maybe a good conversation. Pasqua Rosée's stall in St Michael's Alley in 1652 ran on the same logic. So did the Oxford Coffee Club in the 1650s. So does the room you're sitting in right now, if there's a counter and coffee in the air and a table you can claim for hours.
The room stays the same. The drink and the science behind it—caffeine connecting to adenosine receptors, the dopamine rush, the morning haze disappearing—that hasn’t really changed, either.
Think about it: John Castaing published his price list from Jonathan's Coffee House in 1698. Three centuries later, the market he helped kick off still runs strong. The same kinds of conversations are happening. Now they're just in different rooms, with stronger Wi-Fi and way more complicated milk orders.
Every attempt to ban it flopped. Rulers who tried to shut down the room—didn’t matter who they were—ended up beaten, fooled, or simply forgotten. Kha’ir Beg’s story ended badly; Murad IV drowned in his own vices; Charles II caved in after less than two weeks. Frederick thought coffee sniffers would do the trick, but people just laughed.
The room always wins. It offers something people won't surrender easily: a buzz, a place to sit, and sharp minds circling the table.
Pay attention to what’s in the glass.
DISTILLATE is a production of The Alchemist's Bar — craft mixology through the lens of alchemy as chemistry — and part of the Obscura Meridian family of projects. New episodes every Tuesday at 6:00 AM Central.