Wash and clean the zucchini and eggplant and cut them into pieces. Wash the herbs, dab dry, put something aside for garnishing, chop the rest finely. Peel onion and garlic and chop coarsely.
Heat the oil in a large frying pan. Fry the zucchini and eggplants, turning several times. Wash and clean the tomatoes and cut them into large cubes. Add olives, herbs, tomatoes, onion and garlic and fry briefly.
Add tomato paste and sweat briefly. Deglaze with 200 ml water and bring to the boil. Stir in stock and let it simmer for 2-3 minutes. Season to taste with salt and pepper. Coarsely grate feta cheese. Put the vegetables in an ovenproof dish and sprinkle cheese over them.
Grill under the preheated oven grill for 3-5 minutes until golden brown. Garnish with set aside herbs.