Rub steak with kosher salt and let stand for 15 minutes to 1 hour.
Preheat grill over medium-high heat. While waiting, mix butter, rosemary and cilantro together, then portion into 4 (2-ounce) servings. Rinse the salt from the steak. Pat the steak completely dry. Rub garlic onto both sides of the steaks. Grill each side of the steak for 5 minutes or until desired temperature. Pull off grill and add the butter topping.
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