1. Preheat oven to 425°. Place beef on a wire rack in a jelly-roll pan. Rub butter over beef, and sprinkle with salt and pepper.
2. Bake at 425° for 25 to 35 minutes or until a meat thermometer inserted into thickest portion registers 135° (medium rare). Cover loosely with aluminum foil; let stand 15 minutes before slicing.
Note: We tested with Diamond Crystal Kosher Salt.