Peel and chop the onions. Clean or peel and wash the soup greens. Cut leek into thin rings. Finely dice parsley root, carrots and celery.
Rinse off the ham bones. Place in a large pot with bacon, onions, soup vegetables, peas, peppercorns and bay leaf. Add 3 l water, bring to the boil, cover and simmer for about 3 hours until the peas are slightly overcooked.
Stir more often. If the soup becomes too thick, add 1-2 cups of water.
Peel, wash and chop the potatoes. Add to the soup about 40 minutes before the end of cooking time. Wash parsley, shake dry, chop.
Pick the bacon out of the soup. Cut the rind off the bacon and remove any cartilage. Dice bacon and put it back into the soup.
Heat the sausages in the soup for 3-4 minutes, but do not boil them any more so that they do not burst. Season the soup with salt, pepper, 1 pinch of sugar and seasoning (e.g. from Maggi®). Sprinkle with parsley.