- 2 tablespoons dried food-quality lavender buds
- 2 tablespoons fennel seeds
- 1 tablespoon whole black peppercorns
- 1 tablespoon whole white peppercorns
- 1 1/2 teaspoon dried thyme
- One 4 1/2-pound whole beef tenderloin, trimmed and silverskin removed
- 2 tablespoons olive oil
- The day before serving, grind the lavender, fennel, peppercorns, thyme, and salt to a powder with a mortar and pestle or in a spice grinder. Rub the tenderloin with the spice mixture, wrap tightly in plastic wrap, and refrigerate for 8 to 24 hours.
- Remove the tenderloin from the refrigerator and let sit at room temperature for 30 minutes. Place an oven rack in the center position and preheat the oven to 425°F. Place a rack inside a roasting pan.
- Remove the plastic wrap, brush off the spices from the tenderloin, and rub with 1 tablespoon of the oil. Place the tenderloin on the rack and roast for 15 minutes, turning once halfway through.
- Reduce the heat to 325°F and roast for 5 to 15 minutes longer, to the desired doneness (an instant-read thermometer will read 125°F for medium rare).
- Transfer the roast to a carving board and let rest, loosely covered with foil, for 10 minutes. Meanwhile, add the remaining olive oil to the roasting pan, scrape well, and stir to combine the drippings.
- Cut the tenderloin against the grain into 1/2-inch-thick slices and transfer to a serving platter. Drizzle the pan drippings over the meat and serve.