Barefoot Contessa (en-US)

From the cookbook:

Cooking for Jeffrey

Ice cubes
1 (750 ml) bottle Prosecco, chilled
12 ounces Aperol, such as Barbieri
San Pellegrino or other sparkling water, chilled
6 half-round slices of orange or blood orange

For each drink, fill a 14- to 16-ounce tumbler three-quarters full with ice. Fill each glass two-thirds full with Prosecco, add 2 ounces of the Aperol, a splash of San Pellegrino, and an orange slice, and stir. Serve ice cold.

Aperol Spritzer