Wash the marjoram, dab dry and chop, except for something to garnish. Wash the turkey leg, dab dry and season with salt, pepper and a little marjoram. Place the turkey leg in a large roasting pan and spread a few fat flakes on the meat. Roast in the preheated oven (electric cooker: 200 °C/ gas: level 3) for 1 1/2 - 1 3/4 hours. After approx. 30 minutes pour on the stock. Peel and halve the potatoes. Peel and quarter onions.
Clean, wash and cut leek into rings. Wash and quarter tomatoes. 40-45 minutes before the end of cooking time, spread potatoes, onions and leek around the leg. Season with salt, pepper and remaining marjoram and braise. Mix honey and mustard and brush the leg with it 15-20 minutes before the end of the cooking time. Add the tomatoes and braise. Serve garnished with marjoram and remaining parsley