Wash the roast and pat dry. Coat with oil and season with pepper. Place on a deep baking tray. Cook in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 1 1/2 hours.
Turn several times. In the meantime, peel and wash the potatoes. Peel and wash carrots and cut them diagonally into slices. Peel shallots and halve them according to size. Clean, wash and halve the mushrooms.
Wash the herbs, dab dry, pluck leaves from the stems and chop. Season prepared vegetables with salt and pepper and sprinkle with remaining oil. Put potatoes on the tray 30 minutes, carrots and shallots 20 minutes before the end of cooking time.
Add mushrooms and herbs for the last 10 minutes.