Step 1: Preheat the Oven Properly

Preheat your oven to 425°F (220°C). A hot oven helps create a flavorful crust on the outside while keeping the interior tender.

Allow the oven to fully preheat before placing the beef inside.

Step 2: Prepare the Beef Tenderloin

Pat the tenderloin dry with paper towels. Removing excess moisture ensures better browning.

Rub the entire surface with olive oil, then season generously with salt and freshly ground black pepper. Press seasoning lightly into the meat.

If desired, sprinkle fresh thyme over the surface for added aroma.

Step 3: Roast Until Desired Doneness

Place the tenderloin on a rack in a roasting pan. Roast for 25–35 minutes depending on thickness.

Use a meat thermometer inserted into the thickest part:

• 120–125°F for rare

• 125–130°F for medium-rare

• 135°F for medium

Remove from the oven slightly before reaching your target temperature, as it will continue cooking while resting.

Step 4: Rest the Meat Properly

Transfer the tenderloin to a cutting board and tent loosely with foil. Let it rest for 15–20 minutes.

Resting allows juices to redistribute throughout the meat. Cutting too soon causes juices to escape.

Step 5: Prepare the Balsamic Glaze

While the beef rests, pour balsamic vinegar into a small saucepan. Bring to a gentle simmer over medium heat.

Cook until reduced by half and slightly thickened, about 8–10 minutes. Stir in Dijon mustard at the end for added depth.

The glaze should coat the back of a spoon but not become syrupy.

Step 6: Slice and Serve

Slice the tenderloin into even medallions about ½ to 1 inch thick.

Arrange on a serving platter and drizzle lightly with balsamic glaze. Serve extra glaze on the side.