Wash the tomatoes, cut them in half. Whip vinegar, salt, pepper and oil. Wash and finely chop basil, mix with mozzarella and marinade. Mix one half with red tomatoes, the other with yellow tomatoes
Cut the ciabatta into 16 thick slices. Roast in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for approx. 10 minutes. Cut 8 slices with red and 8 with green
Spread the pesto. Spread tomato mixtures on top