Make a smooth roux sauce

LESSON 09 OF 12 · Cooking Techniques

Make a smooth roux sauce

Learn the flour-and-butter foundation of creamy white sauces and mac and cheese.

Intermediate20 min to read & practice · Recipe time is separate

YOUR KITCHEN WIN

Whisk a lump-free béchamel that gently coats a spoon.

Gather: 25 g butter, 25 g plain all-purpose flour, 300 ml milk, a small saucepan, a whisk, and salt and pepper.

ROUXEqual weights fat + flour
WHISKMilk in small additions
SIMMERSmooth and spoon-coating

Let’s do it, step by step

Illustrative AI-generated step photos. Follow the written instructions for measurements and technique.

  1. Measure before heating

    Weigh the butter and flour, and measure the milk. Set the whisk nearby. Melt the butter gently over medium-low heat without letting it brown.

    Measure the ingredients and melt the butter gently.
    Measure the ingredients and melt the butter gently.
  2. Cook the pale roux

    Add the flour and stir continuously for about 2 minutes, including the corners of the pan. Keep the paste pale and gently bubbling. This short cooking stage gives the flour and butter time to combine.

    Stir the flour and butter into a pale paste.
    Stir the flour and butter into a pale paste.
  3. Whisk in milk gradually

    Take the pan off the heat. Whisk in a small splash of milk until smooth; the mixture will thicken at first. Repeat with small additions, then whisk in the remaining milk once the mixture loosens.

    Add milk gradually and whisk smooth.
    Add milk gradually and whisk smooth.
  4. Simmer and check

    Return to gentle heat, whisking frequently as the sauce thickens. Simmer gently for several minutes, stirring the bottom and corners, until smooth and no longer floury. Season at the end. For cheese sauce, remove from heat before stirring in grated cheese.

    Simmer gently until the sauce coats a spoon.
    Simmer gently until the sauce coats a spoon.

SMALL FIXES, BETTER RESULTS

If it doesn’t go to plan

Lumps appeared?

Take the pan off the heat and whisk firmly. If needed, strain the sauce through a fine sieve before returning it to gentle heat.

Too thick, or catching on the bottom?

Whisk in a little more milk to loosen. Reduce the heat and stir the corners; transfer unburnt sauce to a clean pan if the bottom scorches.

One skill learned. One step forward.

Try the exercise, then mark this lesson complete when you feel ready.