Lemon Sponge Pie
["1 c. sugar", "2 Tbsp. flour", "dash of salt", "1 Tbsp. butter", "grated rind and juice of 1 lemon", "2 egg yolks", "1 c. milk"]
["Blend butter, sugar and flour.", "Add beaten egg yolks, juice and rind of 1 lemon and 1 cup milk.", "Fold in stiffly beaten egg whites.", "Bake in a 450\u00b0 oven for 10 minutes, then down to 325\u00b0 for 25 minutes."]
["sugar", "flour", "salt", "butter", "grated rind", "egg yolks", "milk"]