There’s nothing quite like a well-made cocktail, complete with a thick layer of frothy foam on top. In this article, we’ll teach you how to get that perfect layer of foam on your cocktails every time.

The first step is to use the right ingredients. Most cocktails require some sort of carbonated beverage, such as club soda, seltzer water, or sparkling wine. If you’re using a spirit-based drink, such as whiskey or vodka, you can also add a little bit …