Clean, wash and chop the mushrooms and two spring onions. Dice the bacon and fry it crisply in a pan without fat. Add the mushrooms and fry briefly. Season with salt and pepper.
Mix in spring onions and let them cool down. Add the egg. Spread the filling over the meat and roll up. Tie the roast together with household twine. Rub with salt and pepper and place on the fat pan of the oven.
Roast in the preheated oven (electric cooker: 175 °C/ gas: level 2) for about 2 hours. In the meantime, peel and wash the potatoes and cook in boiling salted water for about 20 minutes. Peel carrots and cut into pieces.
Fry the carrots in hot oil. Mix the spices and 1/4 litre of water. Dust the carrots with flour, pour on the stock and bring to the boil once. Cook for 10 minutes at low heat. Clean, wash and chop the remaining spring onions.
Add to the carrots shortly before the end of the cooking time. Stir in the cream. Season vegetables if necessary. Drain the potatoes. Wash parsley, dab dry and chop. Sprinkle over the potatoes. Cut the roast open and place it on a plate with the vegetables.
Add the potatoes.