The Clover Club is a classic cocktail that originated in Philadelphia in the late 1800s. The cocktail is known for its delicate balance of sweet and sour flavors, as well as its frothy and silky texture, thanks to the addition of the egg white. The Clover Club was a popular drink during the Prohibition era, and was favored by members of the Clover Club, a men's social club based in Philadelphia. It has since become a classic cocktail that is enjoyed around the world, and is often served at speakeasy-style bars and upscale cocktail lounges.