Lemon Sponge Pie
["3 egg yolks", "small lump butter", "1 lemon rind, grated, and juice", "1 c. sugar", "1 c. milk", "2 Tbsp. flour"]
["Beat together egg yolks, butter and lemon.", "Then add sugar, milk and flour.", "Flour", "into 3 stiffly beaten egg whites and pour into unbaked pie shell.", "Bake at 350\u00b0 for 45 minutes or until knife comes out clean."]
["egg yolks", "lump butter", "lemon rind", "sugar", "milk", "flour"]