A Perfect Manhattan is a variation of the classic Manhattan cocktail that uses equal parts sweet and dry vermouth instead of just sweet vermouth. To make a Perfect Manhattan, simply substitute 0.5 oz of sweet vermouth and 0.5 oz of dry vermouth for the 1 oz of sweet vermouth in the recipe. This creates a slightly less sweet and more balanced cocktail that's sure to impress your guests (or your own taste buds)!