Clean the beef, making sure to take off most of the fat. Make consecutive cuts in order to achieve a thickness of between 1/2 and 3/4 of an inch. Mix all ingredients listed for the beef marinade and cover beef with the mix. Let it sit in the refrigerator for at least 30 minutes. Preheat the oven broiler. Scrape the marinade off the beef and place beef on a baking sheet covered in tin foil. Cook in the oven under the broiler for approximately 10 minutes per side, until done. Take beef out of the oven and proceed to shred by separating into strands. Use a couple of forks, a knife, your hands or all of the above! The strands don’t need to be uniform in size or thickness. Heat the 1/4 cup of oil in a saucepan or large frying pan. Place the tomatoes, onion and red pepper in a blender to liquefy and then add to the preheated oil. Cook for about 3 minutes on medium heat. Add the shredded beef, salt, pepper, Worcestershire sauce and ketchup, mixing well to incorporate all ingredients. Cover and let simmer at medium-low heat, stirring often, for around 30 minutes, until the sauce has thickened and all the flavors are incorporated into the beef. Add salt or pepper to taste if necessary. Serves 6.