for next time you could do the following
Cut the meat in long pieces like about 10 inches in lenght and like 2 inches thick.
marinated over night with 2 big yellow onions sliced, 2 green bell peppers sliced, garlic, salt, 1/4 cup worcestirshire sauce, 2 big tomatoes sliced, 1/4 cup sour orange juice and 4 tablespoons of italian dressing.
the cooking day get a deep pot like one for soup (8 qt) get some platains leaf (mexican stores sell them) and use them to line the pot them place the meeat with all the spices that were used to marinate it and fold the top of the platain leaf to cover the meat.
Then add a quart of water to it and cooked at medium heat for like about 3-4 hrs. (I know it is a long time but it is worth) cover the pot with a lid. basically the meat will cook because of the steam. and it will get very tender.
cook some white rice.
make a home made salsa (chopped tomatoes, onions, jalapeno pepper, salt, and vinager) to go ver the meat and the rice and enjoy it.