Wash the goose thoroughly, dab dry and rub with salt and pepper. Close the opening with a wooden skewer and tie up with kitchen string. Put the goose on a fat pan and roast it in the preheated oven (electric cooker: 175°C/ gas: level 2) for 2 3/4 - 3 hours. Drizzle goose bit by bit with 500 ml orange juice. In the meantime clean, wash and quarter the cabbage, cut out the stalk and cut the cabbage into strips. Peel and slice the oranges. Peel and finely chop the onions.
Heat 2 tablespoons of oil in a frying pan, fry the cabbage and onions while turning. Deglaze with the remaining orange juice and stock and let it braise for about 20 minutes. Season with salt, pepper and sugar. 4 minutes before the end of the cooking time, add the orange slices to the cabbage. Put the remaining oil in the pan, heat it up, add the frozen potato balls and fry them at medium heat while turning for 10-15 minutes. Meanwhile wash parsley, dab dry and chop finely. Take the goose out of the oven, place it on a plate and garnish with orange slices, orange peel and parsley as desired. Sprinkle the savoy cabbage with parsley, arrange the potato balls on the plate and serve.