Pour tomato sauce into a pot, then add enough broth so liquid completely covers the bottom. Add onions, a dash or two cinnamon, cumin, chili powder, and curry powder, then sauté over high heat until translucent—about one minute. Turn heat down to low and add frozen vegetables, stirring to warm them. Continue to cook over low heat and stir frequently until vegetables are warm. Add cooked rice and stir to completely combine. As you are stirring, the rice should take on a dark coloring. Add one more tbsp tomato sauce, plus salt and black pepper to taste. For a spicier dish, add hot sauce to taste.