lime or lemon juice

Lime and lemon juice are acidic liquids extracted from the fruits of Citrus aurantifolia (lime) and Citrus limon (lemon), respectively—small, round or oval citrus fruits in the family Rutaceae native to Asia and the Mediterranean region. Both juices are characterized by high citric acid content (typically 5-8% by weight), which provides their characteristic sharp, sour taste. Lemon juice is typically more intensely acidic and has a bright yellow hue, while lime juice is pale green to clear and offers a slightly more complex flavor profile with subtle herbal and bitter notes. Fresh-squeezed juice contains living enzymes and volatile flavor compounds, while commercial bottled versions may be pasteurized or preserved with sulfites and contain added acids.

Lime and lemon juice function as both a flavoring agent and a functional ingredient in cooking across virtually all cuisines. In Latin American cuisine, lime juice is essential to ceviches, cocktails (notably margaritas), and countless salsas and marinades. Lemon juice dominates Mediterranean kitchens, appearing in vinaigrettes, fish preparations, and preservation techniques. Both juices are used to brighten dishes, balance richness, and denature proteins in raw fish preparations. The acidic nature allows them to prevent enzymatic browning in cut vegetables and fruits, while also aiding in the extraction of flavor compounds in marinades and dressings. They serve as a finishing acid to heighten flavors in soups, stews, and sauces without adding salt.