This sherbet in waffle cups is the creation of Jorge Rocha Carmona and his wife, Claudia Mendez, owners of Rome Pastelera, Billy Cross's favorite pastry shop in Oaxaca.
Cooks' notes:
SFor the best texture, make the sherbet the day it will be served. STo quick-chill custard before churning, set bowl in a larger bowl of ice and cold water and stir occasionally until cold.