In a tall glass mix about an inch of Campari with grapefruit juice. Fill with ice.
Aperol Spritz
In a wine glass make an Aperol Spritz by mixing 1-1/2 ounces of Aperol liquer with 2 ounces of Prosecco, and a splash of club soda. Stir once or twice, add ice. Garnish with a slice of orange.