Shortbread Cookies
["1/2 lb. butter", "1/2 lb. margarine", "1 1/2 c. sugar", "2 tsp. vanilla", "5 c. flour, sifted", "chopped nuts (optional)"]
["Cream shortening.", "Add\tsugar", "and", "vanilla.", "Mix flour and add nuts.", "Roll dough into logs with waxed paper.", "Refrigerate. Slice dough;", "place on cookie sheet.", "Bake at 300\u00b0 for 1/2 hour."]
["butter", "margarine", "sugar", "vanilla", "flour", "nuts"]