Olive oil lends a silky texture and a fruity nuance to this Martini riff, while a touch of salt accents an Italian aperitivo’s bittersweetness. The Parmesan-stuffed garnish is worth the extra effort of finding (or making yourself). “The nuttiness of the cheese complements the buttery Castelvetrano olive, rounding out the cocktail perfectly,” says former da Toscano bar manager, Sabrina Lanier.