The Twentieth Century: A Cocktail That Tastes Like Chocolate and Doesn't Apologize

You shake this one, and you shake it like you mean it. Four ingredients, three of them an equal three-quarter-ounce stack of Lillet Blanc, white crème de cacao, and fresh lemon juice, with gin out front at an ounce and a half. Fresh lemon is the whole game. Bottled juice turns this drink into furniture polish, so squeeze it the day you pour it. Use white crème de cacao, not the brown stuff, because the clear version carries the chocolate aroma without dragging in the muddy sweetness and the color of a cough syrup. Hard ice, a hard shake, double strain into a chilled coupe so no shards ride along. The lemon twist matters more than garnish usually does here. Express the oil over the surface, because that citrus perfume is what tricks your nose into reading the cacao as elegant instead of dessert. Skip it and the balance tilts toward the candy aisle.

Under the hood, this is a Sidecar. The Cocktail Codex puts the Sidecar at the head of a family built on a simple, stubborn logic, a complete sour of spirit, citrus, and sugar, where the sweet component is a liqueur doing double duty as flavor and structure. Take a balanced gin sour, then swap the plain sweetener for a liqueur that sits at or below the base spirit in volume, and you get a daisy. That's exactly what's happening here. The crème de cacao is poured at three-quarters of an ounce, under the gin, so it sweetens and shapes the drink without hijacking it. The Lillet acts as a soft aromatic cushion between the sharp lemon and the rich cocoa. It's the same architecture holding up the Aviation, the Bramble, the Cable Car, and the Cadillac Margarita, drinks that look unrelated until you realize they're all the same skeleton wearing different coats. Understand the daisy and you stop memorizing recipes. You start reading them.

The drink is named for the 20th Century Limited, the express train that ran New Yorkers to Chicago in style back when travel still had a dress code. It shows up in print around 1937 in a London cocktail book by C. A. Tuck, credited to an American bartender, which is fitting for a train that connected two American cities and somehow became a transatlantic legend anyway. The era explains the build. The 1930s loved a sour with a secret, a drink that read sophisticated to a public just crawling out from under Prohibition and the watered-down gin that came with it. Putting chocolate in a grown-up's glass was a small act of theater, and unlike most theater it actually delivers. What keeps the Twentieth Century from being a novelty is restraint. The cacao never gets to drive. It rides in back with the lemon screaming up front and the gin keeping order, and the result is one of those rare drinks that earns a double take from people who think they hate gimmicks. It fell out of fashion for decades, the way good things do, and the cocktail revival dug it back up for exactly the reason it deserved digging up. It's clever without being smug. Drink it cold, drink it fast, and don't tell your friends what's in it until they've finished one.