Soak rolls in cold water. Clean and wash the carrots and cut them lengthwise into thin slices with a peeler. Cut these diagonally into rhombs. Drain chanterelles and asparagus.
Peel and chop the onions. Heat 10 g fat in a pot. Fry 1 onion in it until translucent, add chanterelles, cook for 2-3 minutes and remove. Pour broth into the pot and bring to the boil. Add carrots and cook for about 8 minutes.
Add the frozen peas in the last 5 minutes and cook them. Drain the vegetables and collect the broth. Heat the remaining fat in a pot and sauté the flour in it. Pour in milk and 1/4 litre stock while stirring.
Bring to the boil and simmer while stirring for about 5 minutes. Season sauce with salt, pepper and lemon juice. Cut asparagus into pieces and add them together with peas. Add carrots and chanterelles to the hot sauce and keep warm.
Knead minced meat, squeezed out roll, remaining onion, egg, mustard, salt, pepper and thyme. Form 4 meatballs with moistened hands and wrap them with bacon. Pin them with wooden skewers.
Heat the oil in a pan and fry the meatballs for about 10 minutes, turning them over. Arrange vegetables and meatballs on a plate. Serve garnished with parsley. Parsley potatoes taste good with it.