Peel and halve the onion. Boil 1 1/2 litre of water with onion and bay leaf. Add knuckle of pork and simmer for about 2 hours. In the meantime peel and wash the potatoes and cut them into halves or quarters depending on their size.
Peel, wash and slice the carrots with a colored knife. Clean, wash and halve the Brussels sprouts depending on size. Wash parsley, dab dry and chop finely, except for something to garnish.
Remove the knuckle of pork from the stock and let it cool down a little. Add potatoes, carrots and Brussels sprouts to the stock and cook for about 20 minutes. Remove meat from the bone and pluck into small pieces. Add just before the end of the cooking time, season with salt and coloured pepper and sprinkle with remaining parsley.