Lemon Sponge Pie
["juice and rind of 1 lemon", "3 Tbsp. butter, melted", "2 egg yolks", "2 egg whites", "1 c. sugar", "3 Tbsp. flour", "1 c. milk"]
["Mix together all items, except the egg whites, then add beaten egg whites.", "Pour into unbaked pie shell.", "Bake at 350\u00b0 for 30 minutes or until filling is firm."]
["lemon", "butter", "egg yolks", "egg whites", "sugar", "flour", "milk"]