1. Pat steaks dry.
2. Sprinkle salt evenly in a 10-inch cast-iron skillet.
3. Heat skillet over moderately high heat until faint wisps of smoke are visible.
4. Add steaks and cook, shaking skillet after 1 or 2 minutes to loosen them from the bottom, for 6 minutes.
5. Turn steaks over and cook for 5 minutes more for medium-rare.
6. Transfer to a cutting board and let stand, loosely covered with foil, for 5 minutes before slicing.