For the pepper sauce, cut 50 g butter into small pieces and freeze them wrapped in foil. Coarsely crush the peppercorns in a mortar. Wash the thyme, shake dry. Clean, wash and chop the celery.
Peel and chop the onion and garlic.
Heat 1 tablespoon of oil in a saucepan. Fry the thyme, celery, onion and garlic cubes for 4-5 minutes while turning. Stir in tomato paste and sweat briefly. Deglaze with wine, vinegar and stock.
Season with some salt and half of the crushed peppercorns. Bring to the boil and reduce to half at medium heat for 40-50 minutes.
In the meantime peel 2 onions. Dice 1 onion, cut the other into rings. Knead minced meat, diced onion, breadcrumbs and egg. Season with about 1 tsp salt and about 1/2 tsp pepper. Form approx. 8 meatballs from the minced meat mixture and wrap each with 1 bacon slice.
Peel, wash and slice the carrots diagonally. Peel and wash potatoes and cut them into large pieces. Cover the potatoes and cook them in salted water for about 20 minutes.
Heat 2 tablespoons of oil in a large frying pan. Fry the medallions for 6-8 minutes on each side. Take them out and keep them warm. Fry onion rings in hot frying fat while turning them golden brown.
Covered carrots and cook in a little lightly salted water with 1 pinch of sugar for 7-8 minutes. Drain and toss in 1 tablespoon butter, keep warm. Drain the potatoes. Add milk and 1-2 tablespoons butter. Mash everything to puree.
Season to taste with salt if necessary.
Pour the pepper sauce through a sieve into a second pot. Beat the frozen butter pieces bit by bit with a whisk, do not boil any more. Add remaining crushed pepper. Season with salt and 1 pinch of sugar.
Dress everything.