In Speakeasy, Jason Kosmas and Dushan Zaric of Employees Only say that Campari Spritz is the predecessor of the popular Aperol Spritz: "Whereas the Aperol version is soft, the Campari version is bold and assertive."
It's served with a green olive, which is a surprisingly delicious partner for the tangy, slightly bitter cocktail. Consider serving these with a pre-dinner spread that includes cheeses, charcuterie, olives, and pickles.
2 ounces Prosecco or other sparkling wine
1 ounce club soda
2 ounces Campari
garnish: 1 large green olive, or 3 small olives on a pick
Fill rocks glass with ice. Add sparkling wine, club soda, and Campari. Stir gently. Garnish with olives.