1) poke holes in the steak with a fork, not just a few, hundreds, flip over and do it again. it should look all fucked up afterwards.
2) put the steak in a large bowl and add beer (i use budlight, amount depends on how much beef ya got) and A-1 grilling marinade. don't be stingy with it, smother it.
3) let it sit overnight if you can.
4) grill
damn good