Clean, clean and halve the mushrooms. Peel and finely chop the onions. Wash parsley, shake dry, pluck leaves from the stalks and chop finely, except for something to garnish. Mix cheese, parsley and onion cubes. Season to taste with pepper. Spread each meat with 1 tablespoon of cheese. Roll up the meat slices and fix them with wooden skewers
Cut the remaining onion into strips. Heat the oil in a frying pan. Fry the meat rolls for about 5 minutes while turning. Remove, fry the mushrooms and onion strips in the frying fat for approx. 5 minutes. Deglaze with stock. Put the meat rolls back into the pan, close the lid and braise over a low heat for 20-30 minutes, turning occasionally
In the meantime, line the oven rack with baking paper. Spread Rösti corners on the baking paper. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes. Remove the smoked pork rolls from the pan. Thicken the sauce with sauce thickener. Refine with cream. Arrange mushroom sauce, rolls and rösti corners and garnish with parsley