 Starting with tougher cuts the beef is cooked slowly for several hours then sliced thin and served with sweet green pepper on a roll that's been softened in the beef's own juices.Chicago's Puerto Rican population have introduced the skirt steak sandwich Jibarito using fried green plantain instead of bread.Today this sandwich is made with chicken, roast pork, ham, shrimp and even the vegetarian option tofu is available.