Preheat the oven to 200 degrees.
First, salt the steak on both sides and put the steak in the fridge uncovered overnight. This step is optional but seasons the entire steak not just the outside. This makes a world of difference in flavor.
Second, put the steak on a sheet pan with a wire rack and season both sides of the steak with a teaspoon of salt, pepper, and chili seasoning.
Now, put the steak in the oven for 2 hours on the middle rack.
Next, heat the cast iron pan on a medium high heat with oil and butter. When the cast iron pan is super hot add the steak. Cook 2 minutes per side to sear the outside.
Finally, let the steak rest 10 minutes and then enjoy!