Heat olive oil in a large saucepan over medium-high heat. Add onion, carrot, celery, and garlic; sauté 8 minutes or until onion is golden. Add rice, diced tomato, soy sauce, chile, water, and vegetable broth; bring to a boil. Cover, reduce heat, and simmer 30 minutes or until the rice is tender and liquid is almost absorbed. Stir in chopped oregano and chopped cilantro. Garnish with oregano sprigs, if desired.