The classic Manhattan cocktail recipe calls for two parts whiskey, one part sweet vermouth and two dashes of bitters. It's a simple formula that is pretty hard to screw up. When its done right it is amazing. There is a reason this has been one of the world's great cocktails for well over a century.
Combine rye, vermouth and bitters in a mixing glass filled with ice. Stir well.
Strain cocktail into a chilled martini glass.
Garnish with a cocktail cherry.