Mix ingredients together. Feel free to double, triple, or quadruple amounts, depending on how much steak you're marinating. (For a 1.5 pound steak, I double this marinade.)
Rub steak with your favorite rub. (I like to use Jane's Crazy Mixed-up Salt.)
Marinade steak for at least 30 minutes.
Preheat oven to 400° F.
Heat cast iron pan till nice and hot.
Add bacon grease or another fat, such as butter, to your hot pan.
Sear steak for 1-2 minutes on each side, using tongs to turn your steak, and leaving steak for the full time on each side, not flipping back and forth.
Place steak, in your cast iron pan, directly into the oven for roughly 10-15 minutes.