Kumquats are small, oval-shaped citrus fruits that have a sweet and tart flavor. In cocktails, kumquats can be used as a garnish or muddled into the drink itself. They pair well with gin, vodka, and other clear spirits. Kumquats can also be used to make a flavorful syrup that can be used in cocktails like a Kumquat Margarita or a Kumquat Sour. The sweet and tangy flavor of kumquats can add a unique twist to classic citrus-based cocktails.