Using a chimney starter, light natural lump charcoal. Do not use briquettes or match light!
Put a layer of unlit lump charcoal at least 2" thick in your fire pit. Make sure that the pit is free of debris.
When the coals in the chimney starter are lit and have turned white, carefully pour them over the unlit coals in the fire pit.
Sprinkle the Saint Brian's Dash Cunning Spice Rub on all sides of the steak and gently pat on. Wrap tightly in plastic wrap and refrigerate. Allow to dry marinate for at least 30 minutes, or up to 2 hours.
Remove the plastic wrap and place the steak directly on the burning coals. Cook on one side for about 5 minutes.
Using a pair of long tongs, lift the steak off of the coals, and shake any loose embers off by tapping the tongs on the side of the fire pit. Flip the steak and cook on the other side for 4-5 minutes to desired doneness.
Remove the steak from the coals, tapping in the same manner as before to remove any loose coals. Using a clean, dry brush (an unused paint brush or a basting brush will work) brush off any ash. Allow the steak to rest for 10 minutes before serving.