Beef Tenderloin with wine Sauce

Servings: 4-6Prep Time: 20 MinutesCook Time: 1 Hour 20 MinutesTotal Time: 1 Hour 40 Minutes Ingredients For the Sauce 8 tablespoons unsalted butter, divided 3/4 cup finely chopped shallots, from 2-3 large shallots 1-1/4 cups red wine 3 cups beef broth 6 fresh thyme sprigs 1/4 teaspoon kosher salt 1/8 teaspoon ground black pepper 1 teaspoon sugar 2 tablespoons all-purpose flour For the Beef 1 (2 - 3 lb) center cut beef tenderloin roast Kosher salt (1/2 teaspoon per pound of beef) Freshly ground black pepper (1/4 teaspoon per pound of beef) 2 tablespoons vegetable oil 1/4 cup beef broth Instructions For the Sauce Melt 5 tablespoons of the butter in a medium saucepan. Add the shallots and cook over medium-low heat, stirring occasionally, until soft and translucent, 7 to 8 minutes. Add the wine, beef broth, thyme sprigs, salt, pepper and sugar, and bring to a boil. Cook over medium heat for about 30 minutes, or until the liquid is reduced by about half. While the liquid is reducing, place the remaining 3 tablespoons of butter in a small bowl and soften in the microwave, if necessary. Add the flour and, using a small spoon, mix into a smooth paste. Once the wine mixture is reduced, reduce the heat to low and remove the thyme sprigs. Whisk the flour-butter paste, a teaspoonful at a time, into the simmering liquid, and simmer for a few minutes, until the sauce is thickened. Set aside. (The sauce can be made up to this point and refrigerated up to 3 days ahead of time.) For the Tenderloin Let beef stand at room temperature for 1 hour before roasting. Set an oven rack in the middle position and preheat the oven to 400°F. Season the beef all over with kosher salt and pepper. Heat the oil in an oven-proof skillet over medium-high heat until almost smoking. Cook, turning with tongs, until well browned on all but one side, about 10 minutes total. Turn the tenderloin so that the un-seared side is down, and transfer the skillet directly to the preheated oven. (If your pan isn't oven-proof, transfer the beef to a lightly oiled roasting pan.) Roast until an instant-read thermometer inserted into the center of the meat registers 120°F-125° for medium rare, about 15 minutes, or until done to your liking (115°F-120°F for rare, 130°F-135°F for medium).