FOR THE CAKE: Beat egg, egg yolks, and sugar until creamy. Add almonds, chocolate, orange peel, and cake crumbs; continue beating. Fold in gently stiffly beaten egg whites. Bake in two greased and floured 8 or 9 inch cake tins in 300 degrees F. oven for 20 to 25 minutes or until toothpick inserted in center comes clean. When cool split each cake into 2 layers. Spread cream, whipped and sugared, between layers. Pour chocolate icing over top layer.
FOR THE ICING: Cook sugar with water until it spins a heavy thread. Melt chocolate in double boiler; add butter. Add hot syrup gradually, stirring constantly until smooth and until mixture coats spoon.