Sublime Sauce (Salsa Sublime)

Ingredients

• 1 piece butter
• 1 tablespoon flour
• 1 glass boiling milk
• onions, cut into rings
• carrots, chopped
• 1 small bunch parsley
• mushrooms (setas)
• pepper
• nutmeg
• 3 tablespoons flour

Instructions

1. Melt a piece of butter and dissolve a tablespoon of flour into it.
2. Gradually incorporate a glass of boiling milk, stirring without stopping.
3. Add onions cut into rings, chopped carrots, a small bunch of parsley, mushrooms, pepper, and nutmeg.
4. Stir and let it cook over low heat for three quarters of an hour, then pass it through a sieve.
5. In a separate pan, make a light roux with three tablespoons of flour; pour the milk broth over it and let it boil for three minutes.