Bring 5 liters of water to the boil. Cut the vegetables into small pieces, add to the broth with the onion, pepper and allspice and let it steep. Place the chicken in the stock and simmer for 40 minutes, remove, cut in half lengthways and place on a roasting tray. Season with salt, pepper and marjoram, cook in an oven preheated to 180 degrees for 10 minutes.