It is a simple and tasty white sauce, you can use it to prepare lasagna and pasta recipes.
In a saucepan melt butter, over low heat.
When the butter starts to foam add the flour, mixing well with a wooden tablespoon. Cook over low heat 3-4 minutes.
Pour the milk, but not all at once - pour 50-100ml then stir well - and again pour some milk, stir continuously (to avoid formation of lumps).
Let it cook and continue stirring for 5 minutes over low heat.
Add salt, pepper and nutmeg to taste.
Bon Appetite!