3
melt butter (or Margarine) in 3 qaurt saucepan over low heat. Stir in flour, salt, pepper, mustard and worcestershire sauce. Cook over low heat, stirring constantly, until mixture is smooth and bubbly; remove from heat. stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minuute. Stir in cheese. Cook, stirring occasionally, until cheese is melted