Ingredient !
1 1/2 ounces Campari
1 1/2 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.