Clean, wash and cut the peppers into pieces. Clean, wash and slice the zucchini. Peel and roughly chop the onion. Peel garlic and press it through a garlic press.
Wash the tomatoes and cut into slices. Wash the rosemary and basil and dab dry. Pluck the leaves from the stalks, except for a few leaves of basil for garnishing. Cut the basil leaves into strips.
Drain the mozzarella and cut into cubes. Heat oil in a wide saucepan, add bell pepper, zucchini, garlic, onion and tomatoes and fry for about 5 minutes while turning. Season with salt, pepper and paprika.
Add the tomato pulp, basil strips and 3/4 of the rosemary leaves and simmer for about 15 minutes. Add the mozzarella 2 minutes before the end of the cooking time. Season again with salt, pepper and paprika.
Serve ratatouille garnished with remaining herbs.