In the 1860s, at a bar in Milan, Italy, Gaspare Campari — the inventor of his namesake bittersweet herb and botanical-fortified wine — created a cocktail composed of one part Campari, one part red vermouth, and a splash of club soda with an orange-peel garnish. The drink was particularly popular among American tourists in Italy during Prohibition, and became known as the Americano

1. Into a highball glass filled with ice, pour the Campari and vermouth.
2. Add a little soda.
3. Garnish with half an orange slice.