Melt butter over low heat in a heavy saucepan. wooden spoon for stirring is a help. Blend in flour, seasonings, Cook over low heat, stirring until mixture is smooth, bubbly.
Remove from heat, stirring constantly. Boil I minute.
For Cheese sauce: add the dry mustard with the seasonings. Blend in cheese (cut up or grated). Stir until cheese is melted.
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