Fill a mixing glass with ice cubes. Add all ingredients. Stir and strain into a chilled cocktail glass. Garnish with a maraschino berry.
The whiskey-based Manhattan is one of five cocktails named for one of New York City's five boroughs, but is perhaps most closely related to the Brooklyn cocktail, a mix utilizing dry vermouth and Maraschino liqueur in place of the Manhattan's sweet vermouth, as well as Amer Picon in place of the Manhattan's traditional bitters. It is one of six basic drinks listed in David A. Embury's classic The Fine Art of Mixing Drinks.