For the marinade, cut the vanilla pod lengthwise and scrape out the pulp. Mix the vanilla pulp and 3 tbsp. oil. Season with pepper. Wash the fillets, dab dry and brush with the marinade. Cover and let it stand for about 30 minutes in a cold place.
In the meantime, cover the potatoes and boil them in water for about 15 minutes. Clean the carrots, leaving a little green on them if necessary. Peel and wash the carrots and cut them in half lengthwise. Wash parsley, shake dry and chop.
Peel and chop the onions.
Drain the potatoes and rinse with cold water. Preheat the oven (electric cooker: 225°C/circulating air: 200°C/gas: level 4). Peel the potatoes and cut them in half or quarters depending on their size. Mix in a bowl with 3 tablespoons of oil, polenta, salt and pepper.
Brush one half of a baking tray with oil, spread potatoes on top. Bake in a hot oven for about 25 minutes. Turn from time to time.
Heat a pan without fat. Fry the fillets with the marinade in it on each side for 3-4 minutes. Season with salt and place in a small ovenproof dish. Sauté the onions in the frying fat. Deglaze with wine, bring to the boil and simmer for 5-6 minutes.
Season to taste with 1-2 teaspoons of honey. Pour over the fillets. Place the mould on the free half of the tray and bake for about 10 minutes.
Melt the butter in a pot. Steam the carrots for 2-3 minutes. Sprinkle with remaining honey and continue steaming for 1-2 minutes. Stir in crème fraîche and parsley. Season to taste with salt and pepper. Cut the meat thinly and arrange everything.