Citrus zest is the colorful outer peel of citrus fruits like lemons, limes, oranges, and grapefruits. It contains essential oils that give these fruits their bright, tangy aroma and flavor. When you grate or peel the outer layer, you release these oils, making zest a popular ingredient in cooking and baking. It adds a burst of freshness to dishes, desserts, and drinks. Using citrus zest can elevate your recipes by enhancing their taste and aroma. For example, adding lemon zest to a cake can make it more vibrant, while orange zest can brighten up a savory sauce. It's a simple way to bring a little sunshine to your meals!