The seasoned butter can be made ahead. Roll it into a log, wrap it in plastic wrap, and then store in the refrigerator for a week or the freezer for up to a month.
Combine first 4 ingredients and 1/4 teaspoon kosher salt in a small bowl. Cover and set aside.
Rub steaks on both sides with remaining 1/4 teaspoon kosher salt and coarsely ground black pepper. Let stand at room temperature 30 minutes.
Grill steaks, covered, over medium-high heat (350° to 400°) for 7 minutes on each side or until desired degree of doneness. Top each steak with a dollop of seasoned butter.
Find recipes with ingredients that you have on hand.