Drawn Butter Sauce - cooking recipe

Ingredients

1/4 lb butter
1/2 ounce plain flour
5 fluid ounces milk
1 tablespoon lemon juice
salt, if necessary

Preparation

Let the butter soften to room temperature.
Cut it into 8 pieces and roll them in the flour so that it is all absorbed.
Put the pieces into a saucepan and place it over a very low heat, stirring and beating with a wire whisk until you have a pale, creamy mixture.
Gradually add the milk, whisking after each addition; do not worry if it looks strangely rubbery at this point, it will turn back into a creamy sauce as you add more milk.
When all the milk has been incorporated, add the lemon juice and cook the sauce very gently for 5 minutes, whisking constantly.
Serve very hot.