Onions peel and roughly chop. Clean, peel and dice the carrots. Dab meat dry. Heat oil in a roaster, fry meat in it in portions, season with salt and pepper and remove.
Fry the onions and carrots in the frying fat. Add tomato paste and flour and sauté briefly. Add meat again, deglaze with wine and stock. Cover and simmer for about 2 hours
Wash the potatoes and cook in boiling water for about 20 minutes. Drain, rinse with cold water and peel. Cut Reblochon into slices, grate Comte cheese roughly. Cut the potatoes into thick slices.
Place the stew in an ovenproof casserole dish, first Reblochon, then potatoes. Stir the crème fraiche until smooth and place in patches. Sprinkle with Comte. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 30 minutes