01 -
In a medium saucepan over medium heat, melt 4 tablespoons of the butter. Add chopped shallots and sauté, stirring occasionally, until softened, about 4 minutes. Pour in the red wine, 540 ml beef broth, fresh thyme, 0.5 teaspoon salt, and 0.25 teaspoon black pepper. Increase heat to bring to a boil, then reduce heat and simmer for 20 minutes, or until the liquid is reduced by half. Remove from heat. Sauce can be prepared up to 3 days in advance and refrigerated.
02 -
Rub 2 tablespoons of oil evenly over the entire beef tenderloin. Massage chopped rosemary and minced garlic thoroughly onto the surface. Generously season all sides with kosher salt and black pepper. Let the meat rest at room temperature for 1 hour to ensure even cooking.
03 -
Preheat the oven to 220°C. In a large ovenproof skillet or Dutch oven over medium-high heat, warm remaining 2 tablespoons oil and 2 tablespoons butter. Sear the beef tenderloin until well browned on all sides, approximately 7 minutes, turning as needed.
04 -
Transfer the seared tenderloin, in the skillet or onto a baking tray, to the preheated oven. Roast until an internal temperature of 52°C is reached for medium-rare. Use an instant-read thermometer for accuracy. Once cooked, transfer the beef to a plate and let it rest while finishing the sauce.
05 -
Place the skillet or pan used for roasting over medium heat. Add the remaining 60 ml beef broth and scrape the bottom with a spatula to deglaze. Season with an additional 0.25 teaspoon salt. Add this to the reserved sauce and stir to combine. Strain the mixture into a gravy boat for serving. Reheat gently if needed before serving.
06 -
Remove the twine from the beef tenderloin. Slice into 1.25 cm-thick medallions and arrange on a serving platter. Serve warm or at room temperature with the red wine sauce on the side. Optionally, sprinkle with finishing salt just before serving.