Finely chop the garlic and parsley, quarter the tomatoes and finely grate the zucchini with the vegetable grater. Heat the oil and sauté the garlic and parsley in it. Add the zucchini and tomatoes and heat briefly.
Drain the spaghetti in a sieve, collect 125 ml of the cooking water and add to the vegetables. Season with salt and pepper. Mix the spaghetti and vegetables. Serve with parmesan.