Drain and rinse black beans.In a medium saucepan, heat olive oil over medium heat and saute garlic and cumin until fragrant.Add black beans, broth and salt.Reduce heat to medium-low, stirring frequently until beans are heated through.OR, after sauteeing the garlic and cumin, you can place everything in a crockpot on low heat for a couple of hours.If desired, stir in the cilantro just prior to serving.