Flank steak is not one of the most tender cuts of meat. I've tossed enough of the away! The papaya itself not only lends it's flavor to the meat, it actually has an enzyme that tenderizes the meat. Give it a try. You will need to marinate the flank over-night, so make your plans a little ahead for this reason. This is great with a crisp romaine and cherry tomato salad with chunky bleu cheese, and a great wine. If you leave the meat on the cutting board,ve sure to thoroughly wash the board. Another option, which I do, is to have a hard plastic cutting board, which can be sanitized. The marinating time varies, as you may not want to choose the overnight method. I have not included the overnight method.