Step 1: Prepare the Blue Cheese Butter. Place the blue cheese, butter, rosemary, and pepper in a food processor and process until creamy and smooth. Place a 12-inch piece of plastic wrap or parchment paper on your work surface and mound the butter in the center. Roll it up into a cylinder 1 1⁄2 inches in diameter, twisting the ends of the wrap to compact the butter. Refrigerate or freeze until firm. The butter will keep for 5 days in the refrigerator or up to 3 months in the freezer. You can do this step ahead of time.
Step 2: Build a righteous hardwood fire and let it burn down to glowing embers. Using a grill hoe, spread the coals directly under the grill grate (you’re looking for a hot fire on one side and a cooler fire on the other).
Step 3: Season the steaks with the garlic, rosemary, and salt and pepper. Drizzle with olive oil. Pat the seasonings and oil with a fork. When ready to cook, brush and oil the grill grate.
Step 4: Arrange the tomahawk steaks directly on the hottest part of the grill grate along with the rosemary sprigs for a fragrant infusion of smoke. Sear for about 5 minutes per side, rotating the steaks 90 degrees with long-handled tongs after 3 minutes to achieve a nice crosshatch of grill marks. Repeat on the other side.
Step 5: Transfer the steaks to the cooler part of the grill and continue to cook until the steaks are done to your liking—125 to 130 for medium-rare. (The exact time will depend on the strength of your fire and the thickness of the steaks.) If the bones start to burn, slide a sheet of aluminum foil under them.
Step 6: Transfer the steaks to a platter or plates. Top with a disk of the Blue Cheese Butter and let them rest for 2 minutes.
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Steven Raichlen’s Project Smoke is a production of Maryland Public Television, Barbacoa, Inc., and Resolution Pictures. © 2017 Barbacoa, Inc.