Wash the roast and pat dry. Sprinkle with pepper. Place on a greased baking tray. Cook in the preheated oven (electric cooker: 175 °C/ gas: level 2) for about 1 hour. Peel and quarter onions.
After 30 minutes, place on the baking tray. In the meantime, peel, wash and cut the carrots into small pieces. Clean, wash and cut broccoli into small florets. Bring 400 ml of water to the boil, add a little salt.
Cook the carrots for about 12 minutes, then broccoli for about 8 minutes. Drain the vegetables and keep the stock. Add the stock to the roast 10 minutes before the end of the cooking time. Afterwards put through a sieve
For the sauce melt the fat. Sweat flour in it. Deglaze with the stock and cream. Bring to the boil while stirring constantly. Season to taste with salt, pepper, a few dashes of lemon juice and horseradish.
Warm the vegetables in it. Arrange on a plate, garnished with pink berries and lemon wheels.