Trim the Tenderloin: Use a sharp knife to remove any silver skin or connective tissue from the beef tenderloin. If the thinner end of the tenderloin is uneven, fold it under to create a uniform thickness. Secure the shape by tying kitchen twine around the tenderloin at 1-inch intervals.
Season and Rest: Place the trimmed tenderloin in a roasting pan. Sprinkle it evenly with 1 teaspoon of the salt, ensuring all sides are coated. Loosely cover it with plastic wrap and let it sit at room temperature for 1 hour to ensure even cooking.
Prepare the Oven: Position the oven rack in the center and preheat the oven to 500°F.
Make the Garlic-Herb Rub: In a small bowl, combine the olive oil, the remaining ½ teaspoon of salt, minced garlic, black pepper, rosemary, and thyme. Mix thoroughly. Rub the mixture all over the tenderloin, ensuring it is evenly coated on all sides.
Roast the Tenderloin: Roast the beef on the center oven rack for 28–30 minutes, or until a meat thermometer inserted into the thickest part reads 130°F for medium doneness. If you prefer the meat more or less cooked, refer to the Pro Tips & Tricks section for alternate timing.
Let Rest and Slice: Once the roast is out of the oven, transfer it to a cutting board and loosely tent it with foil. Allow the beef to rest for 10 minutes so the temperature rises to 135–140°F, achieving medium doneness. Remove the twine, slice the beef into ½-inch-thick medallions, and serve immediately, spooning any juices over the slices.