1. Sprinkle the salt evenly over all sides of each steak. Set aside 30 minutes to allow steaks to come to room temperature, if desired (see info about this above).
2. Preheat a medium cast iron skillet over medium-high heat. Add oil to skillet and swirl it around.
3. When oil is shimmering, put steaks in the skillet. Cook 5 minutes. Turn steaks, cook until desired temperature is reached, as read on an instant-read thermometer (see * below for approximate times and temperatures).
4. Remove steaks from skillet. If desired, slice butter and put it on top or underneath the steaks. Let steaks stand 5 minutes before serving.

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