Peel, wash and cut the Jerusalem artichokes and carrots into large pieces. Clean, wash and cut leek into rings. Heat the lard. Fry the prepared vegetables for 10 minutes, turning them over.
Season with salt and pepper. Deglaze with broth and cook covered for another 10 minutes. Wash and chop the herbs. Mix with herbs crème fraîche. Roast sunflower seeds in a pan without fat.
Season the vegetable pan to taste again. Serve sprinkled with sunflower seeds. Add herb crème fraîche.