brown butter

Cultured or sweet-cream dairy fat churned until the butterfat separates from buttermilk, yielding a ~80% fat emulsion. European-style butters have higher fat (82–86%) and richer flavor from cultured cream; American-style is typically 80% fat with a cleaner profile. Salted butter extends shelf life; unsalted is the baker's standard for precise seasoning control. Cold butter laminates pastry; soft butter creams into cakes; melted butter binds doughs; browned butter (*beurre noisette*) adds toasted-hazelnut depth.