Peel the potatoes and cook in salted water until soft. Chop into cubes. Sear the beef fillet on the Tepan cooktop. Sauté the shallot in oil, add the cabbage and continue to cook. Add the button mushrooms, gherkins, cooked potatoes and beetroot. Pour in the beef soup, add the cream and boil briefly. Add the fried beef and continue to cook. Season with salt, black pepper and a dash of white vinegar to taste. Serve with a little sour cream and parsley (stirred until smooth).