Lightly season filets with salt and pepper. Place a sauté pan over medium-high heat and add the oil. Place seasoned steaks in the pan and sear each side about 3 minutes. Place a lid on the pan and reduce heat. Cook 3-4 additional minutes. When cooked to desired doneness, remove from pan. Transfer to a plate to let rest as you prepare the sauce.

Turn the heat back up to medium high and add shallots, garlic, wine, mustard and fresh herbs. Reduce heat to medium low and simmer for 5 minutes to concentrate wine flavor. Add demi-glace. Stir and let simmer until thickened. Whisk in cold butter and season with salt and pepper.