How to make:
SHAKE all ingredients with ice and strain back into shaker. DRY SHAKE (without ice) and fine strain into chilled glass.
Lemon zest twist
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.