Bistec Encebollado is simply steak and onions. But there is nothing simple about this favorite Puerto Rican dish which is not only outstanding in flavor but also incredibly easy to make. Although I had already decided on using flank steak, I emailed a couple of Latin American friends to see what cut of meat they preferred. I was surprised to hear that they all use something different. From cube steaks to sirloin, each one had a different preference. How could that be? I decided to stick with th