Peel and quarter the onion and cut into large pieces. Clean, wash and cut the peppers into large pieces. Wash and clean the zucchini and aubergines and cut them into slices about 1 cm thick.
Wash potatoes thoroughly, cut lengthwise into quarters. Wash tomatoes, dab dry and prick several times. Put everything on a tray. Add olives. Peel garlic. Heat olive oil, add garlic to oil.
Wash and clean the herbs and pluck the needles or leaves from the stems. Add herbs and bay leaf to the vegetables. Pour hot olive oil over the vegetables. Season vegetables with sea salt and pepper. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 35 minutes.
Arrange the ratatouille on a plate. Serve with freshly baked country bread.