Black Zapote and Tangerine Drink

Black zapote, with its unusual black pulp, is a tropical fruit harvested in the winter. Mexicans traditionally combine this fruit with orange juice and sherry to make a seasonal dessert, but these can be substituted for tangerine juice for a tasty breakfast beverage, an idea from Patricia Quintana. This drink is best served very cold so leave it in the refrigerator for at least 3 hours before serving, but don't add ice, which would dilute it.