Lemon Pudding Cake
["1/4 c. butter or margarine", "1 1/2 c. sugar", "4 egg yolks", "1/4 c. flour", "2 c. milk", "1 tsp. grated lemon peel", "3 egg whites"]
["Preheat oven to 350\u00b0.", "In large bowl with mixer, beat butter with sugar until well blended.", "Beat in eggs until blended.", "Blend in flour and milk; stir in lemon peel and lemon juice.", "Beat egg whites until soft peaks form when beater is slowly raised.", "Using a wire whisk or rubber spatula, fold egg whites into lemon mixture."]
["butter", "sugar", "egg yolks", "flour", "milk", "egg whites"]