What is the zest of a fruit?

The zest of a fruit refers specifically to the outer, colorful skin of unwaxed citrus fruits, such as lemons, limes, oranges, and grapefruits. This outer layer is valued for its strong and aromatic oils, which can add intense flavor and fragrance to various dishes and beverages. When zesting, the goal is to remove only the colorful part of the skin, avoiding the white pith underneath, which can be bitter. Zesting enhances both the visual appeal and the flavor profile of culinary creations, making it a fundamental technique in cooking and baking.

The other options describe different parts of the fruit: the juicy inner part refers to the flesh of the fruit, while the seeds are contained within the fruit and contribute to reproduction rather than flavor. The pulp is typically the soft, fleshy part of the fruit, further differentiating it from the specialized layer known as zest, which serves a distinct culinary purpose.