milk -

Milk is a nutrient-dense liquid secreted by mammary glands of lactating mammals, most commonly harvested from dairy cattle (Bos taurus), though also produced by goats, sheep, buffalo, and other species. Cow's milk, the most widely consumed globally, is an opaque white or cream-colored liquid composed of water (approximately 87%), lactose (milk sugar), casein and whey proteins, fat, and various minerals and vitamins. The flavor is mild and slightly sweet, with subtle differences depending on breed, feed, and production methods. Milk composition varies by species and individual animal; raw milk exhibits natural variation, while commercial milk is standardized through homogenization and pasteurization or ultra-high temperature (UHT) treatment.

Regional and production variations significantly impact milk quality and characteristics. Jersey and Guernsey cattle produce milk with higher fat and protein content, while Holstein cattle yield higher volume with lower fat content. Grass-fed and seasonal production influence flavor complexity, with spring milk from pasture-grazed animals displaying more pronounced aromatic compounds than grain-fed counterparts.

Milk serves as a foundational ingredient across global cuisines, functioning as both a primary component and a supporting ingredient. It is essential in the production of dairy products including cheese, yogurt, butter, and cream, and appears directly in cooking in sauces (béchamel, crème anglaise), custards, puddings, soups, and baked goods. In beverage preparation, milk features in coffee, tea, hot chocolate, smoothies, and traditional drinks such as Indian lassi and Middle Eastern horchata. Milk-based products are integral to Western, South Asian, Mediterranean, and Scandinavian cuisines. When cooking with milk, temperature control is critical to prevent scorching; addition at the end of cooking or gentle heating prevents separation and curdling.