Americano Highball

The point of this version is length: the same equal parts of Campari and vermouth rosso as a classic Americano, but a full 90 ml of soda water in a tall glass, so it drinks slowly over ice. Soda keeps the drink dry and bitter, the way the Americano has always been served; the grapefruit wheel is the right garnish, since its sharpness points up the Campari.