Ingredients for 1/2 litre:
1/2 litre milk
50gr butter
30gr white flour
Salt and pepper

Preparation:
In a small saucepan melt butter. Use a very low heat

Stir in sieved flour, milk small small and keep stirring. Don’t add anything else till flour has absorbed the poured milk amount.

If you prefer a more liquid or solid sauce add milk or flour.

Cook and stir for 10 minutes more, season with salt and pepper.