In a frying pan, over medium heat, add oil and saute garlic for a minute. Add onion and serrano pepper, saute for 4 minutes. Add ground pork. Break up pork with a wooden spoon, so it cooks evenly. Cook until meat is no longer pink. Drain and rinse black beans and add to pork. Add Goya sauce, cilantro and salt to taste, stir mixture. Cook for an additional 10 minutes.