Amaretto Sour

The Amaretto Sour rode the 1970s liqueur boom into every American bar and promptly became a punchline — almond candy lengthened with bottled sour mix. The drink was never the problem; the spec was. Built instead on fresh lemon, a restrained teaspoon of sugar, and a stiff dose of cask-proof bourbon, it becomes what it always wanted to be: a silky, marzipan-and-citrus sour with real backbone. It is the rare cocktail where the modern rebuild is so widely accepted that it has effectively replaced the original.

History

Nobody signed the Amaretto Sour. Amaretto — led by Amaretto di Saronno, heavily marketed in the United States from the late 1960s — became one of the best-selling liqueurs of the 1970s, and the era's house template (any liqueur, plus sour mix, over ice) did the rest. Like the Midori Sour and the rest of the sour-mix family, it appears to be a product of the speed rail rather than of any documented bartender, and we won't pretend otherwise.

The drink's second act has a much cleaner paper trail. In 2012, Portland bartender Jeffrey Morgenthaler published a recipe under the modest title "I make the best Amaretto Sour in the world," cutting the liqueur with cask-proof bourbon and shaking it with fresh lemon and egg white. The post went deservedly viral, and his spec is now the de facto standard in craft bars — the version below.

The Spec

Amaretto cannot carry a sour alone: at roughly 28% ABV and loaded with sugar, it drinks like dessert the moment you add lemon and stop. The fix is structural. A modest pour of overproof bourbon raises the proof and dries the drink out without turning it into a whiskey sour, fresh lemon does the work sour mix never could, and egg white binds it all into a silky, foam-capped whole. Rocks over fresh ice is the standard serve; up in a chilled coupe, the foam cap gets to show off.

Why cask-proof bourbon

An 80-proof bourbon disappears into this much liqueur. The point of the 3/4 oz is concentration: a barrel-proof bottling in the 55–65% range (Morgenthaler names Booker's) adds oak, heat, and dryness in a small enough volume that amaretto stays the lead. If all you have is standard-proof bourbon, use it — just know the drink will land softer and sweeter.

The egg white question

Half an ounce of egg white is what turns this from a juice into a sour: the foam cap carries the almond aroma and softens the lemon's edge. Dry shake first — hard, no ice — so the egg white emulsifies before dilution. Aquafaba works as a vegan swap at the same measure, and if you skip the foam entirely the drink survives, but loses its best argument.

Sweetness is the dial

Amaretto is the sugar source here; the teaspoon of rich simple syrup only rounds the corners. Brands vary widely in sweetness, so taste before you add it — with a syrupy amaretto you can drop it entirely, and with a drier craft bottling you may want a full barspoon and a half. Resist anything beyond that, or the 1970s come back.

Bottom Line

The Amaretto Sour is the best redemption story in the sour family: a drink everyone agreed was embarrassing turned out to be two honest ingredients away from excellent. Make it with fresh lemon and real proof, and order it without irony.