Wash meat and bones, dab dry. Wash parsley, dab dry and chop except for a little bit for garnishing. Mix cream cheese and parsley. Spread the meat with it and roll it up. Tie together with kitchen string. Rub the roast with salt and pepper.
Place the bones on the coldly rinsed fat pan of the oven and roast in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 1 1/2 hours. In between, gradually pour on 1/2 litre of hot water. Peel, wash and slice the potatoes. Fry in hot fat for about 20 minutes while turning. Season with salt. Clean, wash and possibly halve the beans. Bring the stock to the boil, add the beans and cook for 15-20 minutes. Add lentils 10 minutes before the end of the cooking time and cook. Then drain and toss in remaining fat. Season to taste with salt and vinegar. Remove the roast from the fat pan and remove the thread. Dissolve the roast with a little hot water, pour through a sieve into a small pot, bring to the boil and thicken with sauce thickener.
Add lentils 10 minutes before the end of the cooking time and cook. Then drain and toss in remaining fat. Season to taste with salt and vinegar. Remove the roast from the fat pan and remove the thread. Dissolve the roast with a little hot water, pour through a sieve into a small pot, bring to the boil and thicken with sauce thickener. Stir in crème fraiche. Arrange roast with bean vegetables and potatoes on a plate. Add sauce