Add ingredients to a rocks or wine glass over ice. Garnish with a half-wheel of grapefruit.
Notes
Hosting a party? Here's how to make a large batch for 4-6 people:Combine 3 cups lambrusco rosato, 1 1/2 cups of the Cocchi Americano and 3/4 cups fresh grapefruit juice in a pitcher. When your guests arrive, divide the mixture between ice-filled glasses. Top each with 1-2 ounces of soda water and garnish with a grapefruit wheel. Cin Cin!