Orange zest refers to the outermost layer of the orange peel, which contains the citrusy and aromatic oils that provide a bright and tangy flavor. It is commonly used as a versatile ingredient in cooking and baking to add a burst of citrus flavor to dishes. The zest is often used in recipes for desserts, pastries, marinades, sauces, and dressings. It adds a vibrant citrusy note to cakes, cookies, muffins, and pies. Orange zest can also be used to enhance the flavor of savory dishes such as roasted vegetables, seafood, and poultry.