Zest adds brightness to sauces and glazes by contributing concentrated citrus oils and aromatic compounds from the fruit's peel, providing a fresh, vibrant flavor.
Zest, the colorful outer layer of citrus fruit peels, is packed with essential oils. These oils contain compounds like limonene (in lemons and oranges) that are highly aromatic and flavorful. Unlike the juice, which contributes acidity and sweetness, the zest provides a burst of pure citrus essence without adding significant liquid or sourness. When added to a sauce or glaze, the heat gently releases these oils, infusing the entire mixture with a bright, fresh, and vibrant citrus flavor. The zest's aromatic compounds are also volatile, meaning they easily evaporate and contribute to the overall aroma of the dish, further enhancing the perception of brightness. The absence of the bitter white pith (the layer beneath the zest) ensures a clean, pure citrus flavor.
Use a microplane zester to finely grate the zest, releasing more of the essential oils and preventing large pieces of zest from affecting the texture of your sauce or glaze.