Boil 2 eggs for 8 minutes, quench and let them cool down. Peel and finely chop the onion. Crumble bread finely. Wash parsley and chop finely.
Mix minced meat, remaining egg, bread, onion and parsley well together. Season to taste with salt and pepper.
Form a loaf from the minced dough. Peel the hard-boiled eggs and press them into the middle of the loaf. Press the dough back together again.
Place on a greased baking tray and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for about 50 minutes.
In the meantime, peel and wash the carrots and kohlrabi and cut them into thick sticks. Cook in salt water for about 10 minutes. Add peas and cook for 5 minutes. Clean and wash the mushrooms and cut them into thin slices.
Heat 1 teaspoon of fat in a saucepan and sauté the mushrooms for 3 minutes.
Take the meatloaf out of the oven. Dissolve roast with 1/2 litre water and pour through a sieve to the mushrooms. Bring the sauce to the boil, add the sauce thickener while stirring. Season to taste with salt and pepper.
Drain the vegetables. Heat the remaining fat in a pot and toss the vegetables in it. Cut the meatloaf open and arrange it on a plate with the vegetables. Garnish with parsley. Serve with extra sauce.