Clean, wash and drain the peppers, carrots and zucchini. Cut zucchini into thick slices, peppers and carrots into large pieces. Peel the vegetable onion and cut into slices.
Wash and scrub the potatoes thoroughly. Cut the potatoes in half. Wash thyme and rosemary and shake dry. Pluck off leaves or needles and chop. Put vegetables and potatoes in a large bowl and mix well with oil, chopped herbs, a little salt and pepper.
Pour into the fat pan of the oven, add the stock and braise in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for approx. 1 hour. Stir 1-2 times in between. Meanwhile peel and finely dice the red onion for the herb quark.
Wash parsley and dill, shake dry and chop finely. Cut cress from the bed. Stir curd and milk until creamy. Stir in onion and herbs, except for a little bit for sprinkling, and season with salt and pepper.
Arrange the oven vegetables with the herb quark.