This foolproof oven-roasted beef tenderloin is seasoned with fresh rosemary and thyme, chilled uncovered overnight for a deeply seasoned crust, then roasted low and finished in a hot oven. The result is tender, juicy medium-rare beef that makes an elegant centerpiece for a holiday dinner or special occasion.
Pat the beef tenderloin completely dry with paper towels. Tie it with butcher’s twine every 2–3 inches to help it roast evenly. Drizzle with olive oil and rub it over the entire surface. Season generously with kosher salt and black pepper, then sprinkle with the rosemary and thyme. Place the roast on a foil-lined rimmed baking sheet and refrigerate uncovered overnight.
About 2 hours before roasting, remove the tenderloin from the refrigerator and let it sit on the counter. Position a rack in the center of the oven and preheat the oven to 225°F. Dot the top of the roast with the cold butter.
For the most reliable results, insert a digital probe thermometer into the thickest part of the roast. Place the beef in the oven and roast until it reaches 115–120°F internally, about 60–70 minutes. Remove it from the oven.
Increase the oven temperature to 450°F. Once the oven reaches temperature, return the roast to the oven and cook until its internal temperature reaches 130°F for medium-rare, about 10–15 minutes. Use an instant-read thermometer if you are not using a probe.
Remove the tenderloin from the oven and loosely tent it with foil. Rest for 10 minutes, then remove the butcher’s twine and slice into 1½-inch steaks. Serve as desired, with finishing salt, horseradish sauce, or chimichurri.