For her book, Margarita Time, Imbibe Digital Content Editor Caroline Pardilla collected imaginative twists on the classic cocktail from bartenders around the world. San Diego bartender Erick Castro’s frozen Margarita is a fun take with an elevated element. Inspired by his favorite sparkling cocktail, Sgroppino, Castro subs in lime sherbet for lime juice and agave nectar and adds Champagne for "a really cool texture."