For the glaze, stir 75 g plum jam, cinnamon and 5 tbsp. water until smooth. Peel and chop the onions. Clean or peel, wash and roughly dice the soup greens. Wash the meat and dab dry. Rub with salt and pepper.
Preheat oven (electric cooker: 125°C/circulating air and gas not suitable).
Heat the lard in a roaster or casserole. Brown the meat in it all around, take it out. Sauté onions and vegetables in hot frying fat. Season with salt and pepper. Add 1/2 l water and bring to the boil.
Place the meat in the roaster or stew pot on the vegetables. Coat the top of the meat with some plum puree glaze. Roast meat in a hot oven for approx. 4 hours using the low-cooking method, this makes it particularly tender and juicy.
Meanwhile, brush the meat more often with the glaze until it is used up.
In the meantime, peel, wash and roughly dice the potatoes. Cover and cook in salted water for about 20 minutes. Cover and cook frozen beans in little boiling salted water for 8-10 minutes.
For the boiled potatoes, wash the parsley, shake dry and chop. Drain the potatoes. Add the sour cream and parsley. Swivel everything covered several times and keep warm.
Drain the beans. Heat the butter in the bean pan. Fry diced ham until crispy. Add the hazelnut leaves and roast briefly. Mix in the beans, keep warm.
Remove meat from the roaster and keep warm. Pour the stock through a fine sieve into a pot, squeeze the vegetables a little. Bring the stock to the boil. Peel horseradish and grate finely. Stir 50 g plum puree into the stock, bring to the boil.
Season the sauce with salt and pepper. Cut the meat thinly. Arrange everything.