Once cool, turn the first layer out on a tray or parchment paper. Spread with either jam or chocolate icing. Turn the second layer out on top of the first layer, pressing gently to join. Spread with jam or chocolate icing. Repeat with the third and fourth layers, except with top layer, omit jam or icing and spread with hot glaze. If making loaves, not individual cookies, cut into loaves and then glaze so that the glaze covers the top and sides.