Wash the legs, pat dry and cut through at the joint. Season with salt and pepper. Peel onions and garlic. Dice bacon, garlic and onions.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Heat lard in the roaster. Brown the legs in it for about 10 minutes all around. Add bacon, onions and garlic and fry briefly.
1⁄4 l Pour on water. Braise in the oven for about 1 1⁄2 hours. If necessary, add approx. 100 ml of water in between.
Peel and wash the carrots and potatoes and cut them into small cubes. Spread the potatoes and carrots around the legs after about 1 hour stewing time. Stir in tomato paste. Dissolve broth in 1⁄2 l hot water and pour into the vegetables.
Cover and stew for another 30 minutes.
Crumble bread. Knead with butter, sugar and 1 pinch of salt. Turn up the oven temperature (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Spread bread crumbs on the legs. Bake open in the oven for about 15 minutes.