Clean and chop the vegetables, onions and garlic. Chop parsley.
Heat oil in 2 pots and fry half of the onions and half of the garlic in each pot until transparent. Put tomatoes in one pot and vegetables in the other. Fry everything for 3 minutes, salt and pepper.
Add rosemary, half of the parsley and 4 tablespoons of steamed tomatoes to the vegetables. Season remaining tomatoes with tomato paste and remaining herbs. Simmer the vegetables and tomatoes for 5 minutes and then let them steam for 3 minutes.
Mix the ricotta with the vegetables and season with salt, pepper, nutmeg and paprika.
Pour some tomato sauce into the casserole dish. Fill cannelloni with vegetable mixture and place on the sauce. Cover cannelloni with remaining sauce. Cover with parmesan and bake at 180°C for 45 minutes.