Peel the garlic and press it through a garlic press. Mix yoghurt, sour cream and garlic. Season with salt, chilli and lemon juice, let it stand. Peel onions. Clean and wash the tomatoes and zucchini.
Remove outer white cabbage leaves. Cut the cabbage first into slices, then into fine strips up to the stalk. Wash the strips, drain well. Cut tomatoes into quarters and remove seeds. Cut zucchini, onions and tomatoes into strips.
Heat the oil. Fry the onion and white cabbage strips for about 8 minutes at high heat. Season with salt and pepper. Add zucchini and tomatoes, season again. Season dip to taste again. Bake the flat bread in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 5 minutes.
Cut bread into quarters and cut a deep pocket in each quarter and fill with vegetables and dip.