Wash the meat and pat dry. Rub with salt and pepper. Roast in a large roaster in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 1 1/2-1 3/4 hours open. After approx. 30 minutes pour on the stock
Onions peel and quarter. Clean or peel and wash leek and potatoes. Cut leek into rings and halve potatoes. After about 1 hour, spread potatoes, onions and leek around the leg. Season with salt and pepper and braise with it
Wash the tomatoes, quarter them. Mix honey and mustard. Spread the leg with the mixture 15-20 minutes before the end of the roasting time. Add the tomatoes and braise. Season vegetables to taste. Garnish with herbs if necessary.
For a Mediterranean note, add some thyme and rosemary to the meat together with the potatoes