Zesting a fruit refers to removing the outer part of citrus (the zest) by using a grater, paring knife, surform tool, vegetable peeler, or a zester.  The colorful skin of citrus fruits like citron, lemon, lime, and orange are used to add flavor to food, including sweets and other pastries, and used in cocktails for aroma or as colorful garnishes like twists.  The white portion of the peel under the zest is known as the pith and is often quite bitter and is thus often avoided by adjusting the peeling depth.



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