milk or 2 1/2 dl cream and 2 1/2 dl water or mineral water

Milk is a nutrient-dense liquid secreted by mammary glands of lactating mammals, most commonly obtained from domesticated cattle (Bos taurus), though also from goats, sheep, buffalo, and other species. Cow's milk consists of approximately 87% water, 4.6% lactose (milk sugar), 3.2% protein, 3.7% fat, and 0.7% minerals including calcium, phosphorus, and potassium. The flavor is mild and slightly sweet, with fat content varying by breed, diet, and pasteurization method. Whole milk contains approximately 3.5% fat, while lower-fat variants (2%, 1%, and skim) are produced through mechanical separation. When diluted with water or mineral water (as in the formula provided), the mixture reduces fat and protein density while maintaining hydration and some nutritional benefits, commonly used in historical cooking and certain culinary traditions.

Milk serves as a foundational ingredient across global cuisines, functioning as a beverage, cooking medium, and base for sauces, soups, custards, and baked goods. Cream-water mixtures approximate lighter milks or can serve as cost-effective substitutes in dishes requiring milk's binding and enriching properties without excessive fat. The combination is particularly useful in sauces (béchamel, cream-based soups), custards, and pastry creams where moderate fat content is preferred. Milk's lactose provides subtle sweetness and browning through the Maillard reaction, while its proteins contribute to emulsification and structure in cooking applications.