Lemon Sponge Pie
["2 c. sugar", "3 Tbsp. butter", "4 egg yolks", "2 lemons", "3 Tbsp. flour", "1 pt. milk"]
["Cream all together.", "Bake at 400\u00b0 for the first 15 minutes, then at 375\u00b0 until done."]
["sugar", "butter", "egg yolks", "lemons", "flour", "milk"]