I don't know why I know this, but I found out that kiwi juice is the best meat tenderize that I am cognizant of. I am an army retiree and I have a fixed income. Needless to say that I am frugal and perhaps cheap would be a better description. I buy Choice Eye of Round Steak at the commissary for $3.46 per pound. I cut it in thin slices. For every pound I use one ripe kiwi and marinate the meat for two hours. I make fajitas and pepper steak with this method and the cheap cuts of meat are very tender. I can not detect the taste of the kiwi juice. You should try this at least once, and you would know what I am talking about. If anyone wants the best pepper steak recipe, I am not adverse to share it.