The Whiskey Sour is made with two parts rye whiskey or bourbon, to one part each of lemon juice and simple syrup. Classic sours typically call for two parts of a spirit, along with one-to three-quarter parts each of sweetener and acid. Some sour cocktails feature an egg white for a bit of froth and volume, which is optional for the Whiskey Sour. The acidic citrus in this classic cocktail brings levity to the spice and smoke of barrel-aged whiskey. The Whiskey Sour is shaken and served over ice in a rocks glass.\n\nThe Whiskey Sour is a structured and refreshing cocktail that can be drunk from the afternoon until late in the night.