Clean the soup greens, peel, wash and coarsely chop if necessary. Peel 2 onions and cut into slices. Wash the knuckles and dab dry. Rub with salt, pepper, caraway and marjoram.
Heat clarified butter in a roasting pan. Fry the pork knuckles all around. Add the greens, onion wedges and bay leaf to the meat and fry briefly. Add stock and beer. Braise in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 2 1/4 hours, turning the knuckles again and again or pouring the stock over them.
For the dumplings cut pretzels into small cubes. Heat the milk and pour over the pretzels. Leave to stand for about 30 minutes. Peel 2 onions and dice finely. Heat butter. Sauté diced onions in it, remove from the heat.
Wash the parsley, shake dry and pluck off the leaves. Cut the leaves finely. Add eggs, parsley and onion cubes with butter to the pretzel mass, knead well. Season to taste with salt, pepper and nutmeg.
Form 8 dumplings from it. Boil up plenty of salted water. Slide in the dumplings and let them simmer at low heat for 12-15 minutes. Put the knuckles on a rack 20-25 minutes before the end of the cooking time.
Increase temperature (electric cooker: 225 °C/ circulating air: 200 °C/ gas: level 4) and fry knuckles until crispy. Pass the stock and vegetables through a sieve and season to taste with salt and pepper. Remove the dumplings from the water and let them drain.
Arrange pork knuckles with dumplings and stock on plates. Sprinkle with parsley.