In a large hot saucepan heat oil. Add onion, 1/3 of garlic, red pepper flakes, thyme and saute until onions and garlic are fragrant. Stir in zucchini, 1/3 garlic and tarragon, partially cover pan and cook for approximately 3 minutes or until zucchini has begun to soften. Stir in plum tomatoes with juice, 1/3 garlic and basil, partially cover pan and cook for 7 minutes or until vegetables are crisp tender. Serve over rice. Top with Parmesan.