Wash, peel and cut the potatoes into pieces. Cook in salt water for 15-20 minutes. Wash and clean the Brussels sprouts, cut them crosswise on the stalk. Cook in boiling salted water for about 15 minutes. Dab smoked pork loin dry and fry in hot oil on each side for about 5 minutes.
Heat milk and fat. Drain the potatoes, mash them with a potato masher, stir in the milk and fat mixture, season to taste with salt, pepper and horseradish. Drain sprouts, serve with horseradish puree and smoked pork loin. Garnish with marjoram and leaves