Scottish Shortbread
["2 c. unsalted butter, softened", "1 c. sugar", "5 c. unsifted flour"]
["Cream butter and sugar.", "Beat in flour 1 cup at a time.", "Divide dough into four equal pieces.", "Put each piece in round 8-inch pan; prick dough with fork.", "Bake in 275\u00b0 oven for 1 hour or until pale brown.", "Cool in pan 10 minutes.", "Remove from pan and cut into wedges.", "Sprinkle with sugar.", "(4 pans)"]
["unsalted butter", "sugar", "flour"]