Combine the rye whiskey, dry vermouth, maraschino liqueur, and bitter aperitif (or aromatic bitters if substituting) in a mixing glass filled with ice.

Stir the mixture gently until the outside of the glass feels cold, which usually takes about 30 seconds.

Strain the chilled cocktail into a coupe glass that has been pre-chilled in the freezer for an extra touch of elegance.

Garnish with a maraschino cherry, either dropped in or skewered on a cocktail pick.