This extremely good chocolate cake is baked so that its center remains slightly underdone; overcooked, the cake loses its special creamy quality. It is covered with a chocolate-butter icing, and decorated with almonds. Because of its creamy center it needs no filling. It can be made by starting out with a beating of egg yolks and sugar, then proceeding with the rest of the ingredients. But because the chocolate and the almonds make a batter so stiff it is difficult to fold in the egg whites, we