Wash leg of lamb, dab dry and rub with salt and pepper. Place the meat on the fat pan of the oven. Bake in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for about 20 minutes.
Wash the thyme and remove the leaves from 2 stems. Add the soup vegetables and fry for another 10 minutes. Deglaze with white wine. Lower the temperature (oven: 150 ° C/ gas: level 1) and fry for 2 1/2 hours.
In the meantime, clean, wash and cut the beans into large pieces. Clean and wash the tomatoes, cut off a lid and hollow them out. Clean, wash and thinly slice mushrooms. Peel garlic and 1 onion and chop finely.
Cut the cheese into small sticks. Heat oil in a pan. Fry the mushrooms, onion and garlic in it. Season with salt and pepper. Fold in the herbs and let it cool down. Mushrooms with the cheese misc
15 minutes before the end of the frying time, add to the fat pan. Put the beans in boiling salted water and cook for 15-20 minutes. Peel the remaining onion and dice finely. Heat the fat. Sauté onion in it until transparent.
Swivel the drained beans in it. Keep beans warm. Remove the leg of lamb and tomatoes and set aside covered on a preheated plate. Dissolve the roast with hot broth. Put the soup vegetables in a pot, puree them with a hand blender and bring to the boil, season with salt and pepper and refine with crème fraîche.
Cut the roast. Stuff vegetables around the meat. Pour a little sauce over the meat slices. Garnish with parsley. Add remaining sauce extra.