Put light coat of oil on beef and coat liberally with ancho chile rub.
Heat skillet until smoking hot with ghee, or oil/fat of your choice.
Sear beef for 60-90 seconds per side.
After steak is seared transfer to 275F grill or oven and cook until internal temperature is 130F for medium rare or 140 for medium when measured with an instant read thermometer.
Rest steak for 5 minutes then cut and serve.