1) About 1/2 hour before cooking the steak, bring it to room temperature.
2) Preheat a large cast iron skillet over medium heat. Lightly brush the steak all over with oil and season generously with salt and pepper. Raise the heat to high, add the steak and cook, turning once, until well browned, about 7 minutes for the first side, and 4 minutes on the second side, for medium-rare. Hold the steak with tongs and sear the edges. (An instant-read thermometer inserted perpendicularly into the steak registers 52 degrees C for medium rare.)
3) Transfer the steak to cutting board and cover loosely with foil. Let rest for 5 minutes.
4) Cut the fillet and strip from the bone, and slice against the grain. Transfer to a serving platter and serve au natural, with mustard, compound butter, or horseradish sauce.
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