c. lime juice

Lime juice is the acidic liquid extracted from the fruit of Citrus aurantifolia, Citrus latifolia, or related Citrus species, native to Southeast Asia and now cultivated globally in tropical and subtropical regions. The juice is characteristically tart and bright, with a pH typically between 2.0 and 2.4, containing approximately 4-6% citric acid by volume. Limes vary in appearance from small, green Persian limes (most common commercially) to larger, seedier varieties; the juice flavor ranges from sharply acidic with floral notes to subtly sweet depending on ripeness and cultivar. Fresh lime juice differs significantly from bottled or reconstituted forms, which contain preservatives and lack the volatile aromatic compounds present in freshly squeezed juice.

Lime juice functions as a primary acid in countless cuisines, essential for balancing flavors, curing proteins (as in ceviche), and brightening dishes at the point of service. It is foundational to Latin American, Southeast Asian, and Caribbean cooking, appearing in drinks such as margaritas, daiquiris, and Thai tom yum soup, as well as marinades, salsas, and condiments. The acidity denatures proteins without heat, making it critical in raw fish preparations; its volatile esters provide aromatic complexity to cocktails and dressings. Lime juice pairs exceptionally well with chili, cilantro, garlic, and coconut, and is used both as a cooking ingredient and bright finishing element.