In a skillet brown with some olive oil the onion for 10 minutes on medium heat. Add thick sliced garlic and brown for another 5 minutes. Remove garlic slices. Add eggplant some more olive oil and salt and pepper. Brown another 10 minutes. Remove to bowl.
Add more oil to skillet, cook peppers & zucchini. Brown for 8 minutes. Remove to bowl with other cooked vegetables.
Add tomatoes, parsley, basil, salt & pepper to skillet and gently boil for 10 minutes. Boil in another pot, water for ziti (or rigitoni). Cook pasta and drain.