Preheat the oven to 425°F.
In a large skillet heat oil over high heat until almost smoking. Season beef on all sides generously with salt and pepper and transfer meat to the skillet. Cook beef until well-browned on all sides, turning with tongs when necessary. Transfer beef to a cutting board or platter and, using a rubber spatula or spoon, rub all over with Creole mustard and garlic. Cover meat with chopped herbs, using your hands to evenly pat herbs into the mustard coating. Place prepared filet in a shallow roasting pan and cook about 20 to 25 minutes, or until meat registers 125ºF on a meat thermometer for medium-rare. Remove meat from the oven and let it stand at least 10 minutes before slicing to serve.
Note: Meat may also be served at room temperature, and in this case should not be sliced until just before serving.
Yield: 8 to 10 servings