Useful as recipe-family evidence; not a claim that these are the only or canonical proportions.
Two related sour specifications separated by intervening recipes.
The Whiskey Sour uses whiskey, lime, and sugar; the Boston Sour retains the same basic structure while adding egg white and allowing lemon or lime. Both are shaken with ice, showing a recognizable family with bounded ingredient and texture variation.
PDF sheet 104
PDF sheet 99
Rum, Whiskies & Brandy — Whiskey Sour and Boston Sour
Both retained specifications checked at local PDF sheets 99 and 104 on 2026-08-25.
Verified excerpt record from The Art of Mixology.
Locator
PDF sheets 99 and 104
Research use
Whiskey and Boston Sours retain whiskey, acid, sugar, and shaking while citrus and egg-white texture vary.
Boundary
Supports CLM-30 and CLM-31; separated locators are explicit.
Verification
Checked against the supplied local PDF on 2026-08-25.