Cream two tablespoonfuls of butter with three-quarters of a cupful of sugar, beat in the juice and half the grated rind of one large orange and half the grated peel and juice of one lemon. Whip light, add the beaten yolks of three eggs; fill two pie-dishes lined with puff-paste with the mixture and bake. When the pies are done whip the whites of the eggs stiff with two tablespoonfuls of powdered sugar and spread upon them, returning to the oven for a few minutes to bake the meringue.