So I have been experimenting with beef jerky and I have watched YouTube videos and looked up recipes and for some reason I can't get that really good tender jerky. I have bought eye of round, top round, sirloin top and most recently chuck roast. So the question is when I eat it there are white fibers(or so it looks like) and I believe that is the muscle tissue but that is the tough part of the meat. When I buy jerky I never see this but like I said it almost looks like white hair or something. Please help.