Wash the potatoes the day before, cook in boiling water for about 20 minutes. Drain, rinse with cold water, peel. Let potatoes cool down overnight. The next day put 1 litre of water, vinegar and smoked pork in a pot.
Add juniper, peppercorns and bay leaf. Bring everything to the boil, cover and cook for about 30 minutes.
Peel and chop the onions. Cut the bacon into small cubes. Cut potatoes into slices. Heat 2 tablespoons of clarified butter in a frying pan. Fry the potatoes until golden brown, turning several times.
Add onions and bacon, fry briefly, season everything with salt and pepper. Set aside about 1/4 of the fried potatoes for garnishing.
Clean, peel and wash the parsley roots and cut into slices. Clean, wash and thinly slice the celery, put celery green aside. Heat 1 tbsp. lard in a pot.
Sauté the vegetables in it. Add fried potatoes, deglaze with white wine and stock. Bring to the boil, cover and cook for about 25 minutes. Remove the smoked pork loin from the stock, cut into cubes. Cut celery green into strips.
Add cream and sour cream to the soup, puree finely, season with nutmeg, salt and pepper. Serve the soup sprinkled with remaining fried potatoes, smoked pork loin and celery green.