Preheat oven to 450F. Remove steaks from fridge 10 minutes before cooking and season both sides with coarse sea salt and ground black pepper, to taste. Heat oil in a seasoned cast-iron skillet on medium-high. Make sure the skillet is nice and hot before the next step.
Place steaks into hot pan. Let the steaks cook for two minutes or until a nice brown crust forms. Flip over steaks and cook another two minutes. Transfer the pan into the oven (Careful! It’s hot!) and cook for 4-5 more minutes or until desired doneness. Remove pan from the oven and place the steaks on a cutting board, covering loosely with aluminum foil for 5-10 minutes.
While the steak rests, combine soy sauce and butter. A few minutes before you serve, top each steak with 1 tbsp of soy butter mixture.
