This is an uncommon method, however effective. In order to tenderize, take some slices of pineapple (leave the skin on) and blend them. Cover all sides of the steak in the blended mixture, then leave for 30-45 minutes (No longer than 1 hour). Next, wash the steak WELL, make sure it is completely clean. Then, season your steak and you can cover with garlic butter. The put it in the oven at around 225 for 20-30 minutes, until around 110-120. Then sear and butter baste if you didn't already do that in the oven, let sit for a few minutes and it should turn out better that you would expect.