Go Back
Steven Thomas

Roux - For Thickening Sauces with Flour and Oil

Constant attention pays dividends for the long slow cooking necessary for this recipe.

Ingredients
  

  • 1/2 cup vegetable oil e.g. Canola or Peanut oil
  • 2/3 cups plain flour traditionally equal parts oil and flour by weight; but many authors vary it

Method
 

  1. Heat the oil in a heavy frying pan over a medium high heat until hot (~180° C). It is hot enough when a bit of flour scattered on top sizzles.
  2. Sprinkle 1/4 of the flour on top of the oil.
  3. Stir in with a long handled wooden spoon
  4. Mix the flour and oil into a smooth paste.
  5. Gradually mix in the remainder of the flour in the same way.
  6. Reduce the heat to medium
  7. Cook the roux, stirring constantly. The mix should be on a slow boil, with tiny bubbles constantly breaking. You have to cook it for at least 5 minutes, but a longer cooking time gives a stronger colour and flavour (see the table below).

Notes

1 tablespoon of roux will thicken 1 to 1 1/2 cups of liquid.
Roux should be thick - about the texture of wet concrete or plaster of Paris. Add more oil or flour until it's right.
If roux does burn it will be bitter and unusable - throw it away and start again. Burnt roux will have black dots in it.
This recipe makes one cup - sufficient for the basis of a typical main course - but you can make larger quantities and store it; just place the Roux in a bowl, cover with cling film, with the cling film touching the surface, and place in the fridge.
Adapted from Kelly (1993) and Passmore (1992)