Soak rolls in water. Clean and possibly wash the mushrooms. Heat oil in a pan and fry the mushrooms in it for 4-5 minutes at medium heat. Season with salt and pepper. Let them cool down.
Peel and finely chop the onion. Put onion, minced onion, egg and mustard in a bowl. Season with salt and pepper. Squeeze the soaked roll well, add to the mince and knead everything. Add mushrooms and knead.
Shape the mince into a loaf and place it on the fat pan of the oven. Bake in the preheated oven (electric cooker: 175 °C/ gas: level 2) for about 1 hour. In the meantime cut the bacon into small cubes.
Peel, wash and chop the potatoes and carrots. Clean, wash and also cut the leek into pieces. 40 minutes before the end of the frying time, spread bacon on the meatloaf. Put the potatoes on the fat pan and fry with them.
Little by little add broth. Add carrots and leek 25 minutes before the end of cooking time. Season with salt and pepper. Take the roast out of the oven and let it rest for a while. Arrange the meatloaf and vegetables on a plate and serve garnished with parsley as desired.