If you're able, you can always ask the butcher in your local grocery store to shave the steak for you. With that in mind, you can also easily do it at home! It's an easy process where you would par-freeze the steak and then slice it as thin as possible with a sharp knife. Simply take the steaks out of the package and place them onto a parchment paper covered cutting board. Pop it into the freezer for 30-45 minutes (depending on the freezer and the steaks). You want the steaks to be partially frozen but not completely frozen solid. Once partially frozen, take the cutting board out of the freezer and use a sharp knife to cut the steaks across the grain as thinly as possible.