Ranch-Style White Sauce Makes 1 1/2 cups. 1 1/2 tablespoons margarine 3 tablespoons all-purpose flour 1 1/2 cups fat-free (skim) milk 3 to 4 teaspoons dry ranch-style salad dressing mix 1/4 to 1/2 teaspoon white pepper Melt margarine in small saucepan over low heat. Stir in flour; cook 1 to 2 minutes, stirring constantly. Using wire whisk, stir in milk; bring to a boil. Cook, whisking constantly, 1 to 2 minutes or until thickened. Stir in dressing mix and pepper.