Lemon Sponge Pie
["3 Tbsp. softened butter or margarine", "1 1/4 c. sugar", "4 eggs, separated", "3 Tbsp. flour", "1 1/4 c. milk", "2 Tbsp. grated lemon rind", "1/3 c. lemon juice", "dash of salt", "1 unbaked 10-inch pie shell"]
["Cream butter; gradually add sugar, beating well.", "Add egg yolks, flour, milk, lemon rind, juice and salt.", "Beat until smooth.", "Beat egg whites (at room temperature) until stiff peaks form; fold into lemon mixture.", "Pour into pie shell.", "Bake at 375\u00b0 for 15 minutes; reduce heat to 300\u00b0 and bake 45 to 50 minutes. Cool.", "Yields one 10-inch pie."]
["butter", "sugar", "eggs", "flour", "milk", "lemon rind", "lemon juice", "salt", "shell"]