Lemon Sponge Pudding
["1/2 c. sugar", "1/2 c. flour", "1/2 tsp. baking powder", "3 egg yolks, beaten until light", "1/2 c. lemon juice", "1/2 tsp. lemon extract", "1 1/2 c. milk", "3 egg whites, beaten with 1/2 c. sugar"]
["Sift first 3 ingredients together.", "Mix next 4 ingredients together and add to dry mixture.", "Fold in egg whites.", "Pour into casserole and bake in 1-inch hot water 45 minutes at 350\u00b0."]
["sugar", "flour", "baking powder", "egg yolks", "lemon juice", "lemon extract", "milk", "egg whites"]