Peel, wash and chop the carrots. Clean, wash and cut leek into rings. Steam both in hot fat for about 5 minutes, season
Rinse and drain the lenses. Add to vegetables and sauté. Deglaze with 1 l water. Bring to the boil, cover and simmer for about 45 minutes
Peel, wash and roughly dice the potatoes. Cook in salted water for 15-20 minutes. Drain
Grate cheese. Mix with crème fraiche. Pour potatoes into a greased casserole dish. Season lentil vegetables with salt, pepper and vinegar. Spread some cooking liquid over the potatoes. Add the crème fraiche and sprinkle with seeds
Bake in the preheated oven (electric range: 225 °C / fan-assisted oven: 200 °C / gas: level 4) for 10-15 minutes until golden brown. Wash and chop the parsley and sprinkle over the casserole