Ingredient ! 1 half ounces Campari. 1 half ounces sweet vermouth. 3 ounces soda water (or club soda, as needed to fill glass). Garnish,  ​lemon twist or orange slice.
Preparation ! Pour the Campari and vermouth into an old-fashioned glass filled with ice cubes.
Top with soda. Garnish with a lemon twist or orange slice.