Béchamel sauce is classic culinary European sauce made by
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Béchamel sauce

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What is Béchamel sauce

Béchamel is one of the five French mother sauces, a white sauce made from a butter-and-flour roux cooked with milk. Developed in 17th-century France and named after marquis Louis de Béchamel, it forms the base for dozens of derivative sauces and is a core component of lasagna, moussaka, croque-monsieur, and countless gratins across European cuisines.

Main variations and derivatives

  • Mornay sauce — béchamel with grated gruyère or parmesan, classic for pasta bakes.
  • Soubise sauce — béchamel with sautéed onion purée for meat and poultry.
  • Nantua sauce — béchamel enriched with crayfish butter and cream.
  • Cream of mushroom base — béchamel with sautéed mushrooms as soup base.
  • Crème sauce — béchamel thinned with heavy cream for vegetables and fish.
  • Gratin base — thicker béchamel poured over vegetables or pasta before baking with cheese crust.

Preparation stages

  1. Milk scalding — gently heat milk to 70-80°C with optional onion piqué (bay leaf, clove); infuse 10 minutes.
  2. Roux preparation — melt butter at low heat, add equal weight of flour, cook 2-3 minutes without coloring (blond roux).
  3. Liquid incorporation — gradually whisk hot milk into hot roux (or cold milk into cooled roux) to prevent lumps.
  4. Simmering — cook on low heat 15-20 minutes with frequent whisking, removing raw flour taste.
  5. Seasoning — add salt, white pepper, and nutmeg; adjust to taste near end of cooking.
  6. Straining — pass through fine sieve for perfectly smooth texture.
  7. Surface protection — press plastic wrap onto sauce surface or dot with butter to prevent skin formation.

Common mistakes when preparing Béchamel

  • ❌ Adding cold milk too fast — creates lumps; whisk steadily and add in thirds for smooth sauce.
  • ❌ Browning the roux — for béchamel the roux must stay pale; browning changes both color and flavor.
  • ❌ Skipping the simmer — under 10 minutes cooking leaves raw flour taste; 15-20 minutes is the minimum.
  • ❌ Wrong butter-to-flour-to-milk ratio — classic is 1:1:20 by weight (50 g butter + 50 g flour + 1 L milk) for medium consistency; adjust for thicker or thinner.
  • ❌ Using cold butter or cold flour — roux forms unevenly; both should be at room temperature.
  • ❌ Salting too early — sauce reduces during cooking and can become over-salted; adjust seasoning at the end.

FAQ

What ratio of butter, flour, and milk for béchamel?

Medium sauce: 50 g butter + 50 g flour + 1 L milk (1:1:20). For thicker sauce use 1:1:15; for thinner use 1:1:25. Always equal weights of butter and flour.

Can béchamel be made ahead?

Yes, up to 2 days in the refrigerator. Cover surface directly with plastic wrap to prevent skin. Reheat slowly with a splash of milk, whisking to restore smooth consistency.

Why does my béchamel taste floury?

Undercooked roux. Simmer sauce at least 15 minutes after milk is added. The flour must fully cook to lose the raw cereal taste.

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