The Espresso Martini is the most ordered coffee cocktail in the world, and it is built on a trick of balance: bitter coffee, sweet liqueur and a clean spirit, shaken until a pale foam sits on top. Get the foam and the proportions right and it tastes like cold, sweet espresso with a quiet kick. Get them wrong and it is either syrupy or thin and sour.
There is no single official measure. The IBA (the body that publishes standard cocktail specs) lists 50 ml vodka, 30 ml coffee liqueur and one strong espresso. Many bars shave the liqueur down to 20 ml or less because coffee liqueurs are sweet. The tool below starts from a balanced middle spec and lets you scale it to your glass and push the sweetness up or down.
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Pull the espresso first and let it cool for a minute so it does not melt the ice too fast, but do not leave it sitting: stale coffee turns flat and sour. Fill a shaker with plenty of cold, hard ice, add everything, and shake hard for about 12 to 15 seconds. Double strain (through the shaker's own strainer and a fine tea strainer) into a chilled coupe or cocktail glass. Float three coffee beans on the foam. Tradition says they stand for health, wealth and happiness; mostly they tell the drinker the coffee is real.
Three things are happening. First, bitter meets sweet: espresso is bitter and acidic, and the sugar in the liqueur and syrup rounds it off, the same way sugar does in a latte. Second, the spirit stays neutral. Vodka adds alcohol and body without competing with the coffee, which is why gin or whisky tastes like a different drink. Third, the foam. Fresh espresso carries tiny oils and gas bubbles. Shaking hard with ice whips air into the liquid, and the oils and other compounds in freshly pulled espresso help hold those bubbles in place, so a pale head forms. Use old or weak coffee and the foam is thinner and fades faster.
Fresh, hot espresso, hard ice and a long shake: that is the whole foam recipe.
The drink is generally credited to London bartender Dick Bradsell, who made it at the Soho Brasserie in the 1980s. The story most often told is that a customer asked for something to wake her up and then knock her out; the tale is retold in many versions and the customer's name has never been confirmed. The first version was reportedly vodka, espresso and sugar syrup over ice, and it was only later that it moved to coffee liqueur, a shaker and a stemmed glass. Treat the details as bar lore rather than a documented record.
Swap the vodka for aged rum or tequila reposado for something warmer. Add a pinch of salt or 5 ml of vanilla syrup for depth. For a lighter drink, use 30 ml vodka, 15 ml liqueur and a long espresso. For no alcohol, use the toggle above: strong chilled espresso, vanilla or demerara syrup, a splash of cold water, and the same hard shake over plenty of ice. It will not match the weight of vodka, but the foam and bitter-sweet balance carry over, and it works as an evening treat without the booze.
A single espresso holds roughly 60 to 80 mg of caffeine, and coffee liqueurs add a little more. Caffeine can mask how drunk you feel without making you any less drunk, so pace yourself, keep a glass of water nearby, and be cautious late in the evening if you are sensitive to caffeine. Never drive after drinking, and this drink is for adults only.
Whatever gear you use, four things matter: fresh, hot espresso (a moka pot or a good capsule machine works), a shaker that seals well, plenty of hard ice, and a fine strainer to keep the foam silky.