A citrus zester is a kitchen tool designed to remove the outer zest of citrus fruits like lemons, limes, and oranges. The zest is the colorful outer layer of the peel, which contains aromatic oils that add flavor to dishes. Zesters typically have a small, sharp blade or a series of holes that create thin strips or shavings of zest. Using a citrus zester is simple; just drag it across the surface of the fruit to collect the zest while avoiding the bitter white pith underneath. This tool is popular among chefs and home cooks for enhancing the taste of both sweet and savory recipes.