Peel or clean and wash the soup vegetables. Peel and finely dice onions. Cut the pretzel rolls into slices. Heat milk and pour over the roll. Soak for about 5 minutes.
Fry half of the onions in hot fat until transparent. Drain excess milk from the roll. Add onion cubes, egg and herbs and knead. Season with salt, pepper and nutmeg. Dab meat dry, cut rind diamond-shaped.
Cut a pocket into the meat and add the bread roll filling. Tie together with kitchen twine and fry vigorously all around in hot clarified butter. Add the soup vegetables and remaining onion cubes and fry briefly.
Add caraway and marjoram, pour on broth. Stew meat for 35-45 minutes, remove. Remove kitchen string and cut meat. Pour stock through a sieve, bring to the boil again and thicken with sauce thickener.
Season if necessary. Serve with chive potatoes and kohlrabi in cream sauce.