Wash the potatoes thoroughly, boil them up in a pot with water and cook for about 20 minutes. Drain, quench, peel and slice the potatoes. Wash the meat, dab dry and cut each fillet into 5 medallions.
Wrap a slice of bacon around each medallion. Peel and finely dice the onion. Wash the chives, shake dry, cut into small rolls with only 4-5 stalks for garnishing. Drain fat in a pot, sauté onion in it, dust with flour, sweat on, gradually add stock and cream while stirring.
Bring to the boil, add the capers and season to taste with salt, pepper, sugar and a little caper liquid. Stir in chives. Carefully mix in the potatoes. Keep warm. Drain 2 slices of bacon in a large pan.
Take it out. Heat the oil in the pan. Add meat, fry for 3-4 minutes on each side, season with salt and pepper. Serve the potato-capers ragout in a bowl and the medallions garnished with chives on a plate.