Heat the oil in a medium saucepan over medium heat, add the onio and cook until tender, about 3-5 miutes before adding the jalpen, garlic, and cumin and cooking until fragrant, about a minute.Add the rice, mix in the broth, tomatoes, salt and pepper, bring to a boil, reduce the heat to medium-low, and simmer, covered, until the liquid has been absorbed and the rice is tender, about 17-20 minutes.Mix in the cilantro and lime juice and enjoy!