Peel and chop the onion. Wash the smoked pork, dab dry and cut into cubes. Heat oil in a pan. Fry the smoked pork loin all around, remove. Put potato noodles in the hot frying fat and fry until golden brown, remove.
Add the onion and fry briefly. Add the sauerkraut and braise well. Deglaze with stock and apple juice. Add juniper and bay leaf and season with salt and pepper. Add smoked pork loin and potato noodles and braise covered for about 30 minutes.
In the meantime, mix the sour cream and mustard. Season to taste with salt. Put the sour cream sauce into the pasta pan and mix everything together. Garnish with parsley if desired.