Peel and chop the onion, crush the clove of garlic or cut into fine slices. Heat the oil in a large pan. Sweat the onion and garlic lightly in it. Clean and add the Brussels sprouts. Pour meat stock over the top and cook covered for approx. 15-20 minutes over medium heat. Then season with salt, pepper and nutmeg.
Mix the cheese with the creme fraiche and pour over the Brussels sprouts. Cover and simmer for another 10 minutes.