Bring Tomahawk Steak to room temperature before grilling, about 40 minutes. This promotes even cooking.
Season liberally with flaky salt and cracked pepper. For this size of steak, start with 2 tablespoons of salt and and as much cracked pepper as your heart desires.
Heat grill to 500º.
Drizzle oil on a paper towel, and using grilling tongs, rub it over the grill grates.
Add Tomahawk Steak to the grill, searing for about 3 minutes until charred. Using your tongs and a large grilling spatula, carefully flip the Tomahawk Steak to the other side, searing it.
Reduce the heat on two of your burners to low, and move the Tomahawk steak over the burners, which allows it to cook indirectly. Continue to cook until an instant-read meat thermometer read 130 degrees, which is the range for medium-rare. Cook for longer if you prefer.
Transfer steak to a baking sheet and gently tent with foil. Allow the steak to rest for 15 minutes to allow the juices in the steak to redistribute.
Using a large chef's knife, Carefully slice the ribeye from the bone. Cutting it against the grain, slice the steak into strips and arrange it alongside the bone to display.