Béchamel (White Sauce)
A foundational mother sauce made from a roux and milk, used as a base for countless dishes from lasagna to soufflés.
Prerequisites
- Basic roux technique
Equipment
Steps
Melt butter over medium-low heat until foaming subsides.
Butter stops sizzling — water has evaporated
2-3 minutes
Removing water prevents the flour from clumping when added
Add flour and whisk continuously to form a smooth paste (roux).
Paste pulls away from the sides of the pan cleanly
1-2 minutes
Cooking the roux removes the raw flour taste and activates the starch for thickening
Pour cold milk in a thin stream while whisking vigorously.
No lumps visible — mixture is silky
Cold milk hitting hot roux creates a temperature differential that prevents lump formation
Continue whisking over medium heat until sauce thickens and coats the back of a spoon.
Draw a line through sauce on spoon — it holds without running
5-8 minutes
Starch granules swell and burst, releasing amylose which thickens the liquid
Season with salt, white pepper, and a pinch of nutmeg. Remove from heat.
Sauce tastes rounded, not flat or floury
Sensory Checkpoints
- Sauce coats the back of a spoon
- No raw flour taste
- Silky smooth with no lumps
Common Mistakes
🔴 Lumpy sauce
Cause: Milk added too quickly or not whisked vigorously enough
Prevention: Add milk in a thin stream while whisking constantly
Recovery: Strain through a fine-mesh sieve or blend with immersion blender
🔴 Sauce too thin
Cause: Insufficient roux or not cooked long enough
Prevention: Use correct butter-to-flour-to-milk ratio (1:1:10 by weight)
Recovery: Continue cooking to reduce, or add a slurry of flour mixed with cold milk
🔴 Raw flour taste
Cause: Roux not cooked enough before adding milk
Prevention: Cook roux for at least 1-2 minutes before adding liquid
Recovery: Simmer sauce for an additional 5 minutes
Variations
Cultural Context
One of the five French mother sauces codified by Auguste Escoffier. Its Italian counterpart, besciamella, is essential in lasagna alla bolognese.