juice of 1/2 a lemon

Lemon juice is the acidic liquid extracted from the fruit of Citrus limon, a citrus tree native to South Asia and now cultivated worldwide in subtropical and temperate climates. The juice comprises approximately 5-8% citric acid by weight, which imparts its characteristic tart flavor and bright acidity. Fresh lemon juice is typically extracted by cutting the fruit in half and pressing or squeezing to release the liquid from the flesh, or by using a citrus juicer or reamer. The juice contains both soluble sugars and organic acids in balance, making it a versatile ingredient in both sweet and savory applications. Beyond the juice itself, the expressed liquid may include trace amounts of essential oils from the pith, affecting flavor intensity.

Lemon juice is a fundamental souring agent and flavor enhancer across global cuisines. It brightens dishes through its acidity, balances sweetness in desserts and beverages, and serves as a key component in vinaigrettes, marinades, and sauces from Mediterranean and Middle Eastern traditions. In Asian cooking, it appears in curries, noodle dishes, and seafood preparations. Lemon juice prevents oxidative browning in fruits and vegetables when applied immediately after cutting, making it essential in food preservation. It also tenderizes proteins through acid denaturation when used in marinades. Beyond savory applications, lemon juice is fundamental to beverages ranging from lemonade to cocktails, and to desserts including cakes, custards, and fruit preserves.