Bitters are concentrated flavoring preparations made by infusing herbs, spices, roots, citrus peels, and other botanicals, typically in alcohol. They are known for their pronounced bitterness and aromatic complexity, with flavor profiles ranging from warm and spicy to bright, citrusy, and herbal.
Usually added in small amounts, bitters bring balance, depth, and aroma to cocktails without forming the base of the drink. They are a staple in classics such as the Old Fashioned and Manhattan, while offering versatility for experimenting with new flavor combinations in modern mixed drinks.