Wash the meat and let it drip off. Peel and halve 1 onion and fry it in a large pan without fat for about 5 minutes on the cut surface until dark. Add 3 litres of water, bay leaf, cloves, 3 tsp. salt, onion and peppercorns, bring to the boil.
Add the meat and simmer at medium heat for about 2 1/2 hours. In between, skim off the resulting foam with a skimmer. Clean or peel and wash the soup greens. Put half of the soup vegetables aside.
Cut the remaining vegetables roughly into pieces. Add vegetables to the meat. Cut the rest of the vegetables into thin strips and cover and chill. Peel and wash the potatoes. Peel 4 onions. Roughly grate the potatoes and onion with a food processor.
Stir in egg and flour. Season with salt, pepper and nutmeg. Heat the oil in portions in a large pan (approx. 26 cm Ø). Put about half of the dough into the pan and fry over medium heat for 6-7 minutes until brown.
Turn with a flat lid and fry for another 6-7 minutes until crispy. Keep finished Rösti warm in the oven. Fry the rest of the Rösti dough in the same way. Wash, quarter and core the apples. Cut the fruit flesh into cubes and mix with 2 tsp. lemon juice.
Whip the cream, diced apples, fold in lemon juice and the wasabi. Season to taste with some salt and lemon juice. Take the meat out of the broth. Pour stock through a fine sieve. Measure out 1/2 litre of stock.
Cut the meat into slices and keep warm in the remaining stock. Season measured stock with a little salt if necessary and bring to the boil, add vegetable strips and cook for 4-5 minutes until firm to the bite. Wash parsley, dab dry, pluck from stalks and chop coarsely.
Cut the Rösti into pieces, arrange on plates with bouillon vegetables, meat and wasabi apple salsa. Sprinkle with parsley.