Peel and wash the potatoes, boil them up in salted water and cook for about 25 minutes
Wash the mushrooms, clean them and cut them into smaller pieces. Peel and finely dice shallots. Heat 2 tablespoons of oil in a pan. Fry the mushrooms for about 5 minutes, turning them. Season with salt and pepper and remove. Heat 1 tablespoon butter in a frying pan. Sauté shallots in it until translucent. Add vinegar, sugar and wine and let it boil down for 3-4 minutes. Add stock and let it boil down for another 3-4 minutes. thicken sauce with sauce thickener, add mushrooms, keep warm
Wash the meat and dab dry. Wrap 1 slice of bacon around each medallion and tie it tightly with kitchen string. Season with salt. Heat 2 tablespoons of oil in a frying pan. Fry the meat for approx. 8 minutes, turning it over
Meanwhile roast the pine nuts in a pan without fat, remove them. Heat milk and 1 tablespoon butter in a small pan. Wash the rocket, shake dry and chop coarsely. Drain the potatoes, steam briefly, mash with a potato masher and add the milk. Season to taste with salt and nutmeg. Fold the rocket under the purée and arrange with 1 medallion and 1 balsamic porcini mushroom each. Coarsely chop the pine nuts and sprinkle over the top. Garnish with marjoram if desired.