What is the primary role of bitters in cocktails?

The primary role of bitters in cocktails is to provide a bitter flavor, which adds depth and complexity to the drink. Bitters are concentrated flavor infusions that typically include a variety of herbs, spices, and botanicals, which contribute not only bitterness but also aromatic qualities. This bitterness can help to balance other flavors in the cocktail, particularly sweetness and acidity, creating a more harmonious overall taste.

The use of bitters can transform a simple mixture into a more nuanced cocktail, as their small amount can significantly impact the flavor profile. They are especially important in classic cocktails like the Old Fashioned or Manhattan, where they serve to elevate the drinking experience by providing layers of flavor.

While bitters are often thought of as a way to enhance cocktails, they do not add sweetness, carbonation, or dilute the drink. Instead, they focus on enriching the drink's flavor complexity, making them an essential component in professional bartending.