Lemon Sponge
["2 c. granulated sugar", "4 Tbsp. butter", "4 Tbsp. flour", "2 c. milk", "6 egg yolks", "2 lemons (juice)", "small amount lemon rind"]
["Beat whites separately and then mix all together.", "Bake bottom and filling at the same time.", "Makes 2 large and 1 small pie. Bake at about 400\u00b0 until brown, 20 to 25 minutes."]
["sugar", "butter", "flour", "milk", "egg yolks", "lemons", "lemon rind"]