Scotch Shortbread
["1/2 c. sugar", "1/2 lb. butter (half butter, half margarine)", "4 c. flour"]
["Cream butter and sugar; add flour slowly, about 2 cups, with electric mixer.", "Work the rest in with hands.", "Add only as much flour as butter will absorb.", "When dough no longer sticks to bowl, enough flour has been added."]
["sugar", "butter", "flour"]