Shortbread
["1/2 lb. butter", "1/2 c. very fine sugar", "3 c. flour"]
["Mix together all ingredients; press into 9 x 13-inch baking dish.", "Sprinkle top with sugar and prick with fork.", "Bake in 300\u00b0 oven for 50 minutes."]
["butter", "sugar", "flour"]