Onions peel and roughly chop. Clean, wash and coarsely dice the greens. Wash the meat and dab dry. Rub with salt and pepper. Heat 2 tablespoons of oil in a frying pan. Sauté the meat in it thoroughly, turning it all around. Remove from the roaster. Add the onions and soup vegetables to the cooking fat and fry well, turning them over. Season with salt and pepper. Deglaze with stock. Place the meat on top and bring to the boil. Remove from the stove
Stir 75 g plum jam, cinnamon and 5 tbsp. water until smooth. Spread the meat with some plum puree. Roast in the preheated oven (electric cooker: 125 °C/ convection oven: 100 °C/ gas: unsuitable) for approx. 4 hours, brushing the meat several times with plum puree until it is used up. Peel, wash and roughly dice the potatoes. Cook in boiling salted water for 20-25 minutes
In the meantime heat 250 ml of water. Add the beans without defrosting, bring to the boil, cover and cook for 8-10 minutes, stirring several times. Heat 1 tablespoon of oil in a frying pan, leaving out the ham cubes. Wash parsley, shake dry and chop finely. Stir sour cream until smooth. Drain the potatoes. Add butter, sour cream and parsley. Put the lid on the pot and swivel it vigorously. Keep warm. Pour the beans into a sieve, drain them and put them into the ham cubes, keep warm
Peel, wash and finely grate the horseradish. Roast the hazelnut leaves in a pan without fat, remove
Remove meat from the roaster and keep warm. Pour the vegetables into a fine sieve, catch the stock and squeeze the vegetables with the back of a tablespoon. Pour stock into a pot, bring to the boil, stir in 50 g plum jam and horseradish, season again with salt and pepper
Cut the meat thinly. Arrange meat and beans on plates. Sprinkle with hazelnut leaves. Add the sour cream potatoes in a small bowl