Soak the buns. Boil 3 eggs hard. Then rinse and peel them. Knead minced, raw egg, squeezed roll and mustard. Season with salt and pepper. Shape for frying, putting the boiled eggs in the middle.
Place on a baking tray. Roast in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 60 minutes. Peel onions and cut into eighths. After 30 minutes place them on the baking tray. After another 20 minutes add tomato paste, deglaze with broth. Keep the roast warm. Dissolve roast with 200 ml water, pour through a sieve. Bring to the boil briefly. Stir flour and cream until smooth and thicken the stock with it. Cook for about 2 minutes while stirring. Season to taste with salt and pepper. Wash and chop the parsley.
Bring to the boil briefly. Stir flour and cream until smooth and thicken the stock with it. Cook for about 2 minutes while stirring. Season to taste with salt and pepper. Wash and chop the parsley. Cut the roast open and arrange it sprinkled with the parsley. Serve with the sauce. Boiled potatoes taste good with it