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.
White roux: 2-3 minutes, no colour — the base must be pure white. Add hot milk in three stages for lump-free results. Onion piqué (bay, clove) provides subtle aromatic depth. Simmer 30-45 minutes — raw flour taste must cook out completely. Finish with salt, white pepper, nutmeg.
For the silkiest béchamel, infuse the milk with the studded onion, thyme, and a few peppercorns for 30 minutes before making the sauce — strain and use this aromatic milk. The roux-to-milk ratio for medium béchamel (sauce consistency) is 50g butter, 50g flour, 1 litre milk. For soufflé base, increase to 75g each. A tablespoon of cold butter whisked in at the end (monter au beurre) gives a professional sheen that elevates the sauce from homely to refined.
Under-simmering — if you can taste flour, the sauce is not ready. Adding cold milk to hot roux — thermal shock creates lumps. Skipping the onion piqué — the sauce lacks aromatic depth. Using too much flour — the sauce should coat, not cling like wallpaper paste.
Escoffier, Le Guide Culinaire; Larousse Gastronomique; Carême, L'Art de la Cuisine Française