Roast tomatoes with olive oil for 50 minutes at 400 degrees, separately saute onions (and some red pepper flakes and garlic if desired) with oil spray. Once onions are translucent, add roasted tomatoes, canned tomatoes, fresh basil (1 cup), dried thyme (1 T), 4 cups water (can add chicken stock if you like). Simmer 20-30 minutes. Puree with hand blender.