1. Preheat the oven to 500 degrees Fahrenheit.
2. Place the beef on a baking sheet and pat it dry with a paper towel on the outside. Then with your hands, apply the butter.
3. Season with salt and pepper to taste. Roast for 22 minutes for rare and 25 minutes for medium-rare in the oven.
4. Remove the beef from the oven, wrap it securely in aluminum foil, and set it aside to rest for 20 minutes at room temperature. Remove the strings and thinly slice the filet.

Watch this video recipe to get more familiar with how to cook filet mignon roast.