lemon

The lemon (Citrus limon) is a small, yellow citrus fruit native to Asia, specifically believed to originate in northeastern India or southern China, and now cultivated worldwide in temperate climates. The fruit is roughly elliptical, 2–3 inches long, with thick, dimpled skin and pale yellow color when ripe. Internally, the flesh contains abundant juice—typically 4–6 tablespoons per fruit—that is acidic (pH 2–3) due to high citric acid content (5–6% by weight), balanced with fructose and glucose. The flavor is intensely sour with subtle floral and aromatic notes. Major cultivars include Eureka, Lisbon, and Femminello, each with slightly different juice yields and shelf stability.

Lemon juice is fundamental to global cuisine, functioning as a souring agent, flavor brightener, and preservative. In European traditions, it features prominently in vinaigrettes, hollandaise sauce, and seafood preparations; in Middle Eastern and Mediterranean cooking, it is essential to dishes like tahini sauce and tabbouleh. The zest—the colored outer layer of skin—provides concentrated citrus aromatics and is grated into desserts, marinades, and spice blends. Whole lemons are preserved through salt-curing (preserved lemons) in North African cuisine. Lemon juice prevents enzymatic browning in cut produce and denatures proteins in ceviche.