Ingredients:

• 15g butter;
• 15g flour;
• 25cl milk;
• salt;
• pepper;
• nutmeg.

Preparation:

1. Melt the butter in a large saucepan. Heat the milk in a saucepan.
2. Pour at once all the flour into the melted butter and whisk briskly.
3. Cook over low heat for 2 minutes, stirring constantly, until the mixture is smooth.
4. Remove pan from heat and gradually add the milk, whisking gently.
5. Return to heat for 12 minutes, stirring regularly. Warning: it should not be boiling.
6. Add salt, pepper and nutmeg to your liking.