Filets at room temp. Set oven to 450. Heat cast iron skillet as hot as you can get it. Rub with oil and heavily salt and cracked pepper. Place in cast iron and don't touch for 60 seconds. Flip then and go another 60 seconds. Place a pat of unsalted butter on top of each and put the whole skillet in the oven for 4.5 minutes. Pull out and transfer steaks to a plate and pour juice over the top and let rest 5 min. Greatness.
I do this method with ribeyes as well, but increase sear time to 90 seconds
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