of milk to a boil

Milk is a nutrient-rich liquid secreted by mammary glands of female mammals to nourish their offspring. In culinary contexts, cow's milk is the most commonly used variety, though milk from goats, sheep, buffalo, and other animals also feature prominently in regional cuisines. Milk consists primarily of water, lactose (milk sugar), casein and whey proteins, and fat, with the exact composition varying by animal species, breed, diet, and lactation stage. Fresh liquid milk ranges in color from white to slightly yellow depending on the breed and diet, with a naturally sweet, mild flavor that becomes more pronounced when heated.

Milk is available in various forms including whole milk (3.5-4% fat), reduced-fat or 2% milk, low-fat or 1% milk, and skim milk (less than 0.5% fat). Commercially, milk is typically pasteurized (heat-treated) to extend shelf life and reduce pathogens, or ultra-pasteurized for longer stability. Some regions also utilize raw milk in traditional cheese and fermented product production.

Milk serves as a fundamental ingredient across global cuisines, functioning as a beverage, cooking medium, and base for numerous derivatives. It is essential in sauce preparation (béchamel, crème fraîche), dairy-based desserts (custards, puddings, ice cream), and grain cooking (risotto, rice pudding). Milk is heated to boiling point in many applications to sterilize it, concentrate its flavors, create skin for traditional preparations, or facilitate the formation of curds in cheese-making. In South Asian cuisines, boiling milk is a standard practice before consumption and is fundamental to producing khoya (evaporated milk solids) and paneer (fresh cheese). Milk also acts as a tenderizing agent in marinades and a binding medium in baked goods.