Rub roll roast with salt and pepper. Place 1/2 cup of water and the roast in a roasting pan and roast open in the preheated oven (electric: 200°C/ gas: level 3) for 21/4 hours. In the meantime, clean and wash the peppers, zucchini and tomatoes. Cut pepper lengthwise into strips, zucchini diagonally into slices and tomatoes into wedges. Peel and roughly dice the onions.
Wash the rosemary, dab dry and remove the needles from the stalk, except for a little to garnish. After about 1 1/4 hours spread the vegetables around the roast, sprinkle with rosemary, a little salt and pepper and pour on the stock. Stew until done, turning the vegetables once or twice. Serve garnished with the remaining rosemary. Delicious with baguette