Scotch Shortbread
["5 c. sifted flour", "1 c. sugar", "1 lb. butter, softened"]
["Sift flour with sugar.", "Cut in butter using electric mixer or pastry blender to form dough.", "Press into 13 x 9-inch pan or 2 (9-inch) cake pans.", "Bake 5 minutes at 375\u00b0 and then 45 minutes at 300\u00b0."]
["flour", "sugar", "butter"]