How many counts of bitters are used in a classic Manhattan cocktail?

For a classic Manhattan cocktail, the typical amount of bitters used is 1-2 dashes. This is because bitters are intended to add flavor complexity and depth without overpowering the other ingredients. The Manhattan's primary components—rye or bourbon, sweet vermouth, and a twist of citrus—are meant to shine through, and the bitters serve as a subtle enhancement.

Using 1-2 dashes is a traditional measurement that strikes a balance, ensuring that the cocktail retains its character while benefiting from the aromatic qualities of the bitters. Generally, more bitters can lead to a drink that is too bitter, potentially masking the smoothness of the whiskey and the sweetness of the vermouth, which is why moderation is key in this classic recipe.