Drink garnishes are ingredients added to drinks to enhance their flavor and presentation. Common drink garnishes include zests, limes, and olive twists. Zests are the outermost layer of citrus fruits, such as lemons or oranges, which contain essential oils and flavor compounds. Limes are a type of citrus fruit that is often used to add a tart flavor to drinks. Olive twists are olives that have been cut into a spiral shape and used to garnish martinis.