The type of whiskey used can vary, with options like bourbon, rye, or blended whiskey. The whiskey provides the strong and robust foundation for the cocktail, contributing its distinct character and warmth.

Freshly squeezed lemon juice is a crucial component that balances the strong flavors of the whiskey. The tangy and tart notes of lemon juice add brightness and acidity to the cocktail, creating a refreshing contrast to the richness of the whiskey.

Simple syrup is a mixture of equal parts water and sugar that has been dissolved to create a sweet liquid. It's used to add sweetness to the cocktail, helping to offset the sourness of the lemon juice and create a well-rounded flavor profile.

The addition of egg white is what sets the Whiskey Sour with egg apart from the traditional version. The egg white is responsible for the cocktail's velvety texture and frothy top. When shaken vigorously, the egg white creates a luscious foam that softens the cocktail's flavors and adds a luxurious mouthfeel.

Substitutions:

• Aquafaba: the liquid from a can of chickpeas, can be whipped to create a foam similar to egg whites. Use about 1 ounce of aquafaba as a substitute for the egg white in a Whiskey Sour. Whip it until it forms soft peaks and then add it to your cocktail shaker.