The cooking time all depends on the size and thickness of your steak and how well done you like it. Mine was on the smaller size and not too thick. Season your steak with salt and pepper on both sides. I like mine medium rare, so I cooked it on the first side about 6 minutes in a super hot cast iron skillet in with a tablespoon of butter. Then I flipped it and cooked the other side about 4 minutes. Then I let it rest for 10 minutes to keep in all the juices.
I have also made it half on the stove and half in the oven with a broiler using Bobby Flay’s recipe I read in Bon Appetit. http://www.bonappetit.com/recipe/perfect-porterhouse-steak
- 1 2”-thick Porterhouse steak, trimmed (about 2 lb.)
- 1 tablespoon vegetable oil
- Kosher salt and freshly ground black pepper
- 3 tablespoons unsalted butter, room temperature
Let steak sit at room temperature 30 minutes before cooking, which will help it cook quickly and more evenly.
Heat broiler. Heat a large skillet, preferably cast iron, over medium-high heat, then heat oil in pan until smoking. Season steak very generously with salt and pepper and cook until a deep brown crust forms on underside (do not turn), about 4 minutes. Transfer steak to a cutting board, turning it browned side up.
Cut meat from bone in 2 pieces (strip steak and filet mignon). Slice both pieces straight down perpendicular to the bone 1” thick. Replace sliced steak around the bone (it should look like a whole sliced steak) and return to skillet, browned side up. Top with butter and broil until butter is melted and steak is medium-rare, 4–6 minutes. Serve steak with buttery pan juices spooned over.