Ingredients:
2 tablespoonfuls of butter
1 yolk of an egg
1/2 cup of milk
1 saltspoonful of pepper
1 tablespoonful of flour
1/2 cup of stock
1/2 teaspoonful of salt


Directions:
Rub the butter and flour together, add the stock and the milk and stir until boiling; add the salt and pepper, take from the fire and add the beaten yolk of the egg, heat for a moment over hot water, and it is ready for use.