Lemon zest is the bright yellow part of the peel of a lemon. It is used in foods and as a garnish for both food and drinks. To obtain this zest, many cooks and bartenders employ the use of tool called a lemon zester or citrus zester. Using this tool, one can quickly and easily scrape the zest off of the citrus fruit.
Most zesters are roughly 4 to 6 inches (10 to 15 cm) long. They generally have a handle with a metal end that resembles a very small cheese grater. Fine holes on the metal end of this tool have sharp edges that remove the zest when it is dragged across the rind of the fruit.