Chocolate Gravy

This is a very old country recipe.

1 cup granulated sugar
2 1/2 tablespoons cocoa
3 tablespoons flour
1/4 teaspoon salt
3 1/2 cups whole milk
1/4 cup (1/2 stick) margarine

Mix dry ingredients well and add milk until smooth.

Melt margarine in iron skillet. Add mixture and cook until desired consistency.

Serve over biscuits.