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1
Place the pepper flakes in a small bowl and pour the boiling water over them. Let sit for 1 to 2 minutes to rehydrate the flakes. Combine all of the remaining marinade ingredients in a blender, or in a bowl using an immersion/stick blender. Stir in the pepper flakes and the soaking water.
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2
Place the steaks in an extra-large resealable plastic bag (or divide between two large bags). Pour over the marinade, squeeze any excess air from the bag, and close. Roll the bag to evenly coat the meat in the marinade, and refrigerate for at least an hour or up to 3.
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3
Place a lightly oiled cast-iron griddle on one area of a well-oiled charcoal or gas grill. Preheat all areas to high.
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4
In a small saucepan, combine all of the resting butter ingredients, stirring to combine as the butter melts. Pour about 1/2 cup of the butter into small bowl and set aside. Pour the remainder into a baking dish or disposable aluminum pan, preferably a 13 1/2 X 9 5/8 X 2 3/4 inch lasagna pan.
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5
Remove steaks from the bag, letting any excess marinade drip into the bag. Lightly pat dry with paper towels. Season lightly with salt and pepper and, using your hands or a brush, evenly, but lightly, coat with canola oil.
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6
It is preferable that the steaks be moved to a clean area of the griddle and grate every time they are flipped. Depending on the griddle and grill size, they may need to be cooked in batches to ensure there is a clean portion of the grill to flip to.
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7
Place the steaks on the griddle, close the lid, and do not move them for 3 minutes. Flip the steaks over on the griddle, close the lid and do not move them for 3 minutes. Aggressively rub the bone and both sides of the steak with the whole garlic (you may want to move each steak off of the heat temporarily), then brush with the 1/2 cup of butter.
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8
Transfer the steaks to the grate.
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9
Continue to grill with the lid open, flipping, jockeying, and stacking throughout the cooking until you reach the desired doneness; about 3 minutes per side for rare, about 4 minutes per side for medium rare, about 5 minutes per side for medium, about 6 minutes per side for well-done.
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10
Remove the steaks from the grill, place in the resting butter, turn to coat, and let rest for 5 minutes.
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11
Meanwhile, clean and re-oil the grill grates.
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12
Place the steaks back on the grate and do not move them for 1 minute. Flip them over and repeat for 1 minute. Remove from the grill, place in the pan with the butter, and let rest for 5 minutes.
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13
Drizzle some of the resting butter on the board and top with the steaks. Cut to separate the meat from the bone and slice the meat on a diagonal into 1/4-inch slices. Dredge in the butter and top with and sprinkle with fleur de sel and pepper.
