Heat coconut oil in cast iron skillet on medium high heat
Preheat oven to 350
Trim excess fat from tenderloin
Sear tenderloin on all sides
Remove tenderloin from heat, cover skillet with foil and place in for 40 minutes
Combine mustards, garlic, and wine in mixing bowl
Return mixture to containers
Remove tenderloin from oven after 40 minutes and coat liberally with mustard mixture.
Return tenderloin to oven and cook uncovered for 30 minutes
Remove tenderloin from oven, remove from oven, tent with foil and permit to rest.
Scrap pan with fork combining drippings.
Slice tenderloin and cover with dripping