Roux
A cooked mixture of equal parts fat and flour used as a thickening agent for sauces, soups, and stews. The foundation of French sauce-making.
Equipment
Steps
Melt fat (butter, oil, or rendered dripping) over medium heat.
Fat is liquid and shimmering but not smoking
1-2 minutes
Add flour all at once and stir immediately to combine.
Smooth paste forms with no dry flour visible
Adding all at once ensures even hydration of starch granules
For white roux: cook 2-3 minutes, stirring constantly. For blond roux: cook 4-5 minutes until golden. For brown roux: cook 8-15 minutes until deep brown and nutty.
White: no color change, raw smell gone. Blond: light golden, toasty aroma. Brown: deep mahogany, nutty fragrance.
Longer cooking develops flavor but reduces thickening power as starch breaks down
Sensory Checkpoints
- No raw flour smell
- Smooth paste consistency
- Color matches target stage (white/blond/brown)
Common Mistakes
🔴 Burnt roux
Cause: Heat too high or not stirring enough
Prevention: Use medium heat and stir constantly, especially for brown roux
Recovery: Discard and start over — burnt roux tastes bitter and cannot be salvaged
🔴 Lumpy when liquid is added
Cause: Liquid and roux at similar temperatures
Prevention: Add cold liquid to hot roux, or warm liquid to cool roux — temperature contrast prevents lumps
Variations
Cultural Context
The roux technique originated in French cuisine and was adopted into Cajun and Creole cooking, where dark roux became the soul of gumbo. The word comes from the French "beurre roux" (browned butter).