| 2 fl oz | Bourbon whiskey |
| 3/4 fl oz | Lemon juice (freshly squeezed) |
| 1/2 fl oz | Sugar syrup 'rich' (2 sugar to 1 water) 65.0°Brix |
| 1/2 fl oz | Egg white (pasteurised) or Fee Brothers Fee Foam cocktail foamer |
Serve in a Coupe glass
One serving of Boston Sour contains 209 calories
Whereas the addition of egg white to a Whiskey Sour is optional, egg white is a requisite in a Boston Sour – a Boston Sour is simply a Whiskey Sour with egg white.
See: Whiskey Sour cocktail History
Bourbon whiskey soured with lemon juice and smoothed by egg white.
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