Sauce Béchamel — White Roux and Milk Mother Sauce

Béchamel is the most ubiquitous of the five mother sauces — a white roux of butter and flour moistened with hot milk, simmered until the starch is fully hydrated and the raw flour taste has cooked away. Its simplicity is deceptive: a poorly made béchamel is gluey, floury, and reminds the diner of school cafeterias, while a properly made one is silky, glossy, and barely perceptible as a thickened sauce. The roux must be truly white — cook equal parts butter and flour for 2-3 minutes over gentle heat, stirring with a wooden spatula, until the mixture froths and smells faintly of biscuit but develops no colour whatsoever. Hot milk is added in three stages: a splash first, whisked vigorously to form a smooth paste; then a third of the remaining milk, whisked until homogeneous; then the rest in a steady stream. The sauce is brought to a gentle simmer, and a studded onion (onion piqué — half an onion pierced with a bay leaf and two cloves) is submerged in the sauce. This perfumes the béchamel with a subtle aromatic background. Simmer for 30-45 minutes, stirring every few minutes to prevent the bottom from catching, then remove the studded onion and pass through a fine chinois. The finished béchamel should pour like thick cream, coat a spoon evenly, and taste of butter and warm milk with a whisper of bay and clove. If it tastes of flour, it has not simmered long enough. Season with fine salt, white pepper, and a grating of nutmeg — the classical finish that transforms bland white sauce into something with quiet depth.