Generously sprinkle both sides of meat with blackened spice mix. Bring to room temperature before cooking. Preheat barbecue.
Cook steak to desired doneness, cooking times will vary depending on the cut of meat and thickness of the steak.
For those nice grill marks on a thick steak cook 2-3 minutes, do a quarter turn and continue cooking on the same side another 2-3 minutes.
Turn the steaks and cook the same way on the second side. That's 4-6 minutes to get the outside nicely charred.
Move the meat to the upper rack to finish cooking, 5-10 minutes to desired doneness. Check internal temperature with an instant read thermometer by sticking it in the side of the steak. 140°F for rare, 150°F for medium rare. The temperature will increase about 5 degrees as the meat rests. You can always put it back on if it's under done. If it's cooked too long you're eating over done steak.