Aperol's distinct flavor and color are obtained by combining bitter orange, gentian, rhubarb, and a variety of herbs and roots in a secret recipe that has been unaltered since 1919. Try an Aperol Spritz with an orange twist, made with 3 parts Aperol, 2 parts Prosecco, and 1 part soda over ice. It's one of the best thirst-quenching cocktails around.