Butter

French cuisine builds a taxonomy around butter's thermal states. Beurre noisette (hazelnut butter) is cooked to 150 °C until milk solids brown and emit a nutty aroma — the base of financiers and meunière sauce. Beurre blanc is an emulsified reduction of white wine and shallots mounted with cold butter off-heat; it breaks above 65 °C, so it is never boiled. Beurres composés (compound butters) — maître d'hôtel, bercy, café de Paris — are rolled, chilled, and sliced to finish grilled meats. Puff pastry (feuilletage) uses a dry beurre sec (84%+ fat, low moisture) for distinct lamination.

Northern Italian cooking — particularly Lombardy, Piedmont, and Emilia-Romagna — relies on butter where the south uses olive oil. Burro fuso (melted butter with sage leaves) is the canonical sauce for agnolotti and ravioli, letting the pasta flavor lead. Risotto mantecatura finishes the dish off-heat with cold, cubed butter stirred vigorously to create a creamy emulsion without further cooking. Milanese pastries (pan di Spagna, sbrisolona) use whole butter for a short, crumbly texture.

American Southern baking turns on fat-flour technique: biscuits use cold cubed butter (or lard) cut into self-rising flour; the steam from water in butter pockets creates flaky layers during baking. Bananas Foster was invented at Brennan's New Orleans in 1951 — bananas caramelized in butter, brown sugar, and banana liqueur, flambéed and served over ice cream. Apple crisp stacks sliced fruit under a rubbed-in butter-oat-sugar topping that bakes to a crumbly crust.