Wash the knuckle of pork and boil it in a pot with 2 1/2 l water. Pre-cook for about 1 hour
Remove the knuckle, let it drain. Incise rind. Place on a fat pan and bake in a hot oven (electric cooker: 200 °C / convection oven: 175 °C / gas: level 3) for approx. 1 hour. Coat the knuckle of pork with mustard approx. 10 minutes before the end of the roasting time
Peel and chop the onions. Clean, wash and chop the leek and peppers. Heat the oil. Fry everything in it. Add sauerkraut and bay leaf. Deglaze with apple juice, braise for about 20 minutes
Season sauerkraut with salt, pepper and sugar. Arrange everything. Wash and chop the parsley and sprinkle over it. Serve with mashed potatoes
Drink: cold beer