Boulevardier

Glassware: Rocks glass or chilled coupe

1 1/2 oz. bourbon (or rye)
1 ounce Campari
1 ounce sweet vermouth

Garnish: orange twist

Stir all of the ingredients well with ice in a mixing glass, then strain into a chilled coupe or over ice into a rocks glass. Garnish.

Source: Imbibe