01 - Pat steaks dry with paper towels and brush both sides evenly with olive oil.
02 - In a small bowl, blend kosher salt, black pepper, minced garlic, and rosemary. Rub mixture thoroughly onto both sides of the steaks.
03 - Preheat grill (gas or charcoal) to high heat, 450–500°F.
04 - Arrange steaks on the grill grates. Cook for 4 to 5 minutes per side for medium-rare, adjusting cook time for preferred doneness. Confirm internal temperature with a meat thermometer: 130°F for medium-rare, 140°F for medium.
05 - During the final minute of grilling, top each steak with 1/2 tablespoon unsalted butter, if desired.
06 - Transfer steaks to a cutting board. Tent loosely with foil and allow to rest for 5 minutes to retain juices.
07 - Serve steaks hot, accompanied by lemon wedges if preferred.