Dab meat dry. Rub with salt and pepper and place on the cold rinsed fat pan of the oven. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for approx. 1 1/2 hours.
In the meantime, clean the red cabbage, cut into strips, wash and drain. Peel onion and lard with cloves. Heat the lard in a pot. Sauté the red cabbage and onion briefly.
Pour on vinegar and 1/8 litre of water and braise for about 1 hour. If necessary, add more water in between. Wash apples thoroughly, cut into quarters and remove seeds. Peel and wash horseradish. Coarsely grate an apple and horseradish.
Mix with egg yolk. Brush the roast about 20 minutes before the end of the cooking time and add to the cooking. Cut remaining apples into slices. Add to the cabbage about 15 minutes before the end of the cooking time and cook.
Season cabbage with salt and sugar. Arrange roast and cabbage on a plate. Wash parsley, dab dry and chop. Sprinkle over it. Boiled potatoes taste good with it.