Velouté Sauce

• 2 tablespoons butter
• 2 tablespoons flour
• 1 pint

Melt butter in the top of a double saucepan; add flour and cook for a few minutes to form pale roux. Add boiling stock, salt and pepper, and cook, stirring vigorously with a whisk until well blended. Add mushroom peelings or stems; reduce heat and simmer gently, stirring occasionally and skimming from time to time, until the sauce is reduced to two-thirds of the original quantity and is