Throw the stock, oil, garlic, chili powder, crushed chili flakes, cumin and rice into a rice cooker. A pot on the stove works too, obviously. Once the rice is done (or almost done if you're doing stove-top), throw in the chopped tomatoes, corn, black beans, cilantro and lime juice, and mix well. Let everything get nice and warm together, then serve. I often serve it with a nice steak.