Coat each fillet steak with the brown sugar making sure that the whole steak is covered . Place in air tight container and add bourbon until the steak and brown sugar is covered with the bourbon. Refrigerate/marinate for about 3-4 hours.
Cook steak in hot pan for about 3 minutes each side then put aside to rest. Heat small amount of Bourbon and Sugar mixture until hot and thick plate steak and pour the heated bourbon over the steak.