|2 fl oz||Bourbon whiskey|
|3⁄4 fl oz||Freshly squeezed lemon juice|
|1⁄2 fl oz||Giffard Sugar Cane Syrup|
|1⁄2 fl oz||Pasteurised egg white|
Difford's Guide remains free-to-use thanks to the support of the brands in blue above.
Bourbon whiskey soured with lemon juice and smoothed by egg white.
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.
A history of the Whiskey Sour cocktail can be found on our page.