Peel onions and garlic, halve onions and cut them into thin slices. Chop the garlic. Heat 2 tablespoons of oil in a frying pan. Fry the onions and garlic until translucent. Add chili flakes and tomato paste and continue to fry for 2-3 minutes. Season with salt and pepper and place in a round casserole dish (24 cm Ø)
Wash and clean the tomatoes, zucchini and eggplant. Cut everything into evenly thick slices. Layer the vegetables alternately close together, almost vertically, in the mould. Season with salt and pepper and drizzle with 6 tablespoons of olive oil. Close the tin with aluminium foil and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 1 hour.
Grind the mozzarella finely. Remove aluminium foil and sprinkle on vegetables. Bake at the same temperature for another 15 minutes. Garnish with basil. Add toasted baguette bread