German Christmas Butter Cookies
["6 c. flour", "3 eggs (separate 2; save whites for top glaze)", "1 lb. butter", "juice of 1 lemon", "1 c. sugar", "1 Tbsp. baking powder"]
["Mix butter and sugar until creamy.", "Add one whole egg and 2 yolks and the juice of lemon.", "Sift flour and baking powder; add butter mix.", "Roll between two pieces of wax paper quite thin. Stamp out shapes.", "Mix a little cold water with egg whites and blend with fork.", "Brush on cookies.", "Decorate cookies with nuts, colored sugar, etc.", "Bake approximately 15 minutes at 350\u00b0."]
["flour", "eggs", "butter", "lemon", "sugar", "baking powder"]