2Heat olive oil in a Dutch oven over medium heat. Add onion and sauté until tender and translucent, about 8 minutes. Add tomato purée, vegetable broth, peas, basil, oregano, thyme, garlic, pepper, and red pepper flakes. Stir, bring to a simmer, and cook for 5 minutes. Add rice and mix well. Cover and simmer, adding a bit of water if necessary to keep rice from sticking to the bottom, until tender, about 18 minutes.