Wash the turkey leg, dab dry and rub with salt, pepper and lemon peel. Place the clay pot in cold water for 15 minutes. Clean and wash the Brussels sprouts. Peel onions and cut into slices.
Wash, peel and cut the potatoes into pieces. Put 2/3 of the vegetables into the clay pot and season with salt, pepper and nutmeg. Place the turkey leg with the skin side up and spread the rest of the vegetables around the leg.
Pour on the stock. Cover and place in the cold oven on the lowest shelf. Heat up the oven (electric: 225°C/ gas: level 4) and roast everything for two hours. Stir the vegetables once or twice in between.
Fry for the last ten minutes without the lid so that the leg is really crisp.