Clean, wash and chop the soup vegetables. Peel 1 onion and cut into slices. Wash the meat, dab dry and place in a freezer bag with the soup greens, onion wedges, bay leaf, clove, mustard and peppercorns.
Place in a bowl, add the red wine, port and 3/8 litres of water and bind firmly. Marinate for 1-2 days, turning occasionally. Place the roast on a sieve and collect the marinade.
Dab meat dry. Heat clarified butter in a roaster and fry the meat all around. Season with salt and pepper and lift out. Roast the soup greens in hot frying fat and add 1/2 litre marinade.
Put the meat into the pan, bring to the boil briefly and braise covered for about 2 hours. If necessary, add the remaining marinade later. In the meantime clean and wash the carrots, celery and leek. Cut carrots into slices and leek into strips.
Dice the celery. Steam vegetables in little boiling salted water for 10-15 minutes. Peel remaining onions and cut them into slices. Heat the fat in a pan and fry the onions. Toss the drained vegetables briefly in the pan and season with lemon pepper.
Remove the roast from the stew stock and keep warm. Pass the braising stock through a sieve and bring to the boil. Add sauce thickener and bring to the boil while stirring. Season to taste with salt and pepper. Cut the meat open and arrange on a plate with the vegetables.
Garnish with laurel. Serve with extra sauce. Boiled potatoes taste good with it.