Core five good-sized tart apples, cut them in thin slices, put them into a saucepan with half a cupful of water, cover the saucepan, cook quickly until the apples are soft; press them through a sieve. While they are hot add four tablespoonfuls of butter. Beat the yolks of six eggs with two cupfuls of granulated sugar; add a quart of milk, a teaspoonful of vanilla extract and the apples; pour the mixture into a baking-dish and bake in a quick oven for thirty-five minutes. Beat the whites of the eggs until fairly stiff, add six tablespoonfuls of powdered sugar, and beat until fine and dry. Spread this over the top of the pudding, dust thickly with powdered sugar, and put the pudding back in the oven for just a moment to brown nicely. Serve it cold. A pudding made of the quantity of materials given here will be sufficient for ten persons.