Fry the pork goulash in hot fat. Dice the onion and fry a little. Cut the apples into small cubes and add them, then add the sauerkraut. Deglaze with broth and white wine. Season well with salt, pepper, sugar and paprika powder. Let it cook for about 1 1/2 hours, adding a little more liquid if necessary. Finally stir in the beaker of sour cream.