What is the function of bitters in cocktails?

Bitters play a crucial role in cocktails by adding complexity and depth of flavor. They are concentrated flavoring agents made from herbs, spices, and other botanicals, which can introduce a range of intricate tastes—such as bitter, herbal, or spiced notes—to a cocktail. This complexity can help to balance out sweetness, acidity, and other flavor elements, making the overall drink more nuanced and enjoyable.

In many classic cocktails, bitters are essential for achieving the desired flavor profile. For example, in a Manhattan or an Old Fashioned, just a dash of bitters can transform the drink, enhancing its character and ensuring that no single flavor dominates. This depth is particularly important in well-crafted cocktails, where a balance of flavors contributes to the overall experience.