Beat the yolks of six eggs, add a cupful of sugar, and the grated rind and juice of half a lemon. Sift in half a cake of grated bitter chocolate, a teaspoonful of baking-powder, with a pinch each of cinnamon, and clove, and enough flour to make a thin batter. Fold in the stiffly beaten whites of the eggs and bake in layer-cake pans. Put together with currant jelly. [Ice with frosting made of a beaten egg, a cupful of powdered sugar, and half a teaspoonful of vanilla.]