Classic Sour

Boston Sour

Name: Boston Sour
Total time: 2 min
Ingredients: 50 ml Bourbon; 25 ml Fresh Lemon Juice; 20 ml Simple Syrup (1:1); 20 ml FOAMY WHITES

The Boston Sour is the egg white variation of the Whiskey Sour and demonstrates how texture can completely transform a familiar cocktail. The addition of FOAMY WHITES creates a dense, silky head while maintaining the classic balance between whiskey, citrus and sweetness.

Boston Sour served in a rocks glass with a dense white foam over bourbon, photographed on a warm off-white surface.

Glass: Rocks Glass
Ice: Large fresh ice cubes
Difficulty: Easy
Technique: Single shake · Standard strain

Ingredients

50 mlBourbon
25 mlFresh Lemon Juice
20 mlSimple Syrup — 1:1
20 mlFOAMY WHITES

Method

01Fill a shaker with large ice cubes.
02Add all ingredients.
03Shake hard for approximately 10–12 seconds.
04Strain over fresh large ice cubes.
05Serve immediately.

Build

Glassware: Rocks Glass
Ice: Large fresh ice cubes
Garnish: None
Technique: Single shake · Standard strain

Tasting notes

Balanced
Silky
Rich
Classic

Family: Sour

Origin

Era: Late 19th century
Place: —

The Boston Sour emerged as the egg white variation of the Whiskey Sour during the late nineteenth century and remains one of the best demonstrations of how texture changes a cocktail.

Bartender notes

Unlike fruit-based sours, fine straining is unnecessary here.
Standard straining preserves the foam while allowing tiny ice fragments to melt naturally over the serving ice.

FOAMY WHITES Note

FOAMY WHITES creates the defining texture of a Boston Sour without requiring a dry shake.