Lemon zest is the outer, colorful skin of a lemon, a citrus fruit known for its bright flavor. It contains essential oils that give it a strong, aromatic scent and a tangy taste. Zest is often used in cooking and baking to enhance the flavor of dishes, adding a fresh and vibrant note. To obtain lemon zest, the outer layer of the lemon peel is grated or scraped off, avoiding the bitter white pith underneath. It can be used in a variety of recipes, from desserts to marinades, and is a popular ingredient in beverages like lemonade and cocktails.