Wash the meat and pat dry, season with salt and pepper. Place the meat on the fat pan of the oven and bake in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: level 1) for approx. 3 hours.
Clean, wash and coarsely chop the soup greens. Add vegetables and 1/2 litre of water to the meat approx. 1 hour before the end of the frying time. Mix sugar beet syrup and 3 tablespoons of water and brush the roast with it 5 minutes before the end of the cooking time.
Clean and wash the cauliflower and divide it into small florets. Cook the cauliflower in boiling salted water for about 10 minutes. Add peas and carrots to the cauliflower after 5 minutes. Remove the roast and keep warm.
Pour stock through a sieve and fill up to 1/2 litre with water. Bring everything to the boil. Stir flour and a little water until smooth, thicken sauce with it and let it swell for about 5 minutes. Season with salt and pepper.
Pour the vegetables on a sieve and let them drip off. Melt the butter and toss the vegetables in it. Arrange meat and vegetables on a plate. Add the sauce. Bread dumplings taste good with it.