Make ahead to use in the Wild-Mushroom Nachos, and the Chicken-and-Rajas Enchiladas, or just for dipping. The beans can be stored in an airtight container in the refrigerator for up to two weeks.
Heat oil in a large nonstick skillet over medium-high heat. Add carrot; sauté 5 minutes. Add onions and garlic; sauté 2 minutes or until tender. Stir in cumin and beans; partially mash mixture with a potato masher. Cook 10 minutes or until thick, stirring frequently. Stir in cilantro.