The key ingredient in the ultimate aperitif: The Negroni. 

Equal parts Campari, Gin, and Sweet Vermouth, stirred, served up or over a large ice cube. Orange Rind to garnish.

(Tip, save your flat black rectangular take-out containers, fill with water, leave in the freezer over night, and chip away when ready to serve to achieve those big, unfussy, slow to dilute ice cubes that will up your cocktail game.)