Remove filets from the refrigerator 45 minutes before cooking to lose their chill
Preheat oven to 400 degrees
Season liberally on both sides with kosher salt and fresh cracked pepper
Preheat a pan (at least 10" wide) over medium high heat just to the smoking point. Add a thin layer of oil and sear the filets on both sides for 2-3 minutes.
Add butter and once melted add garlic and rosemary (or thyme). Begin basting the steaks 30 seconds each in the butter.
Remove the fresh herbs and garlic from the pan and place the pan in the oven for 5 minutes. Check the internal temperature. For medium rare pull the steaks out at 125 degrees, for medium pull them at 135 degrees.
Let the steaks rest on a plate for 5-10 minutes before serving.
For the truffle butter melt bacon fat and butter together. Add the minced garlic and cook for 2-3 minutes. Right before the garlic browns, remove it. Add the truffle salt and cook until the salt dissolves.