This side dish is low in calories and fat and a quick way to dress up black beans, which are a good source of fiber and protein. Try it with pinto beans as well.
Heat the oil in a medium saucepan over medium-high heat. Add the jalapeno and garlic and cook, stirring, until fragrant, about 30 seconds. Add the beans, 1/3 cup water, oregano and 1/8 teaspoon salt and cook, stirring, until most of the liquid is evaporated, about 3 minutes. Remove from the heat, stir in the lime juice and adjust seasoning. Transfer to a serving bowl, sprinkle with the cilantro and lime zest if using and serve.