Sear the minced meat briefly and season with salt and pepper. Then turn the flame down a little and add the tomatoes. The sauce is now very thick, so add a little water (approx. 1/2 cup) until the desired consistency is achieved.
Let the sauce simmer gently over a low flame and add the stock cube. When it has completely dissolved, add the parmesan and season the sauce with the herb mixture. Finally add the crème fraîche.