Clean, wash and drain the soup greens. Cut carrots, leek and parsley root into thick slices. Chop celery roughly. Wash and peel the potatoes and also cut them into large cubes. Roughly dice the celery. First layer the smoked pork loin, then the potatoes and then the soup vegetables in a roasting pan.
Add bay leaf and season with pepper (no salt!). Pour on the stock, if necessary put some butter flakes on top. Cover the bottom shelf of the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) and braise for about 1 1/4 hours. Wash parsley, shake dry and chop. Season the finished layer pot with pepper and possibly a little salt and serve sprinkled with parsley