Wash the potatoes. Cook in water with the caraway and possibly parsley for about 25 minutes. Quench potatoes, peel and let them cool down
Peel and finely chop the onion. Heat 2-3 tablespoons of oil. Sauté onion in it. Deglaze with 1/4 l water and vinegar, bring to the boil and stir in stock. Season with salt and pepper. Cut potatoes into thin slices. Pour hot marinade over the potatoes and leave to stand for about 1 hour.
Debark the toast and grind in the universal chopper. Cut meat loaf diagonally in half. Whisk the egg. Turn meat loaf first in flour, then in egg and finally in toast crumbs. Press the breadcrumbs well
Heat the remaining oil. Fry the meatloaf in it until brown on each side. Wash the chives, chop finely and fold into the salad. Season to taste again. Arrange everything and garnish with egg, horseradish and radish