Heat a medium cast-iron skillet until hot. Lightly rub the steak with olive oil and season generously with salt and pepper. Add the steak to the hot skillet and cook over moderate heat until browned on the bottom, about 6 minutes. Add the garlic cloves, herb sprigs and butter to the skillet. Turn the steak and cook for 5 minutes. Using kitchen tongs, turn the steak on each side and cook until browned, about 2 minutes per side. Lay the steak flat, baste it with the butter in the skillet and turn the garlic cloves. Continue to cook the steak for about 5 minutes longer, until an instant-read thermometer inserted in the center registers 125° for medium-rare. Transfer the steak and garlic cloves to a cutting board and let rest.