In a large bowl combine dry milk, flour, and salt. Mix well. With a pastry blender cut in butter or margarine until mixture resembles fine crumbs. Lightly pack in a large airtight container. Label White Sauce Mix and store in refrigerator. Use within 2 months. Makes about 1 quart of mix.

To Make Basic White Sauce:

Use 1/2 cup White Sauce Mix and 1 cup of cool water. Combine in a small sauce pan (for thinner white sauce decrease the mix to 1/4 cup or for thicker white sauce increase mix to 3/4 cup). Cook over low heat until smooth, tirring constantly. Season with pepper, herbs, and spices. Makes about 1 1/2 cups of sauce.

Substitute milk, tomato juice or chicken or beef stock for all or part of the water.

Cheese Sauce: Add 1/2 to 1 cup Shredded Cheddar cheese after mixture thickens. Stir until cheese is melted.

Curry Sauce: Add 1 t curry powder to thickened mixture.