FRESH-HERB BEEF TENDERLOIN WITH BALSAMIC ROASTED ONIONS

Steps:

• For the tenderloin:
• Preheat oven to 375°F.
• Dry well the beef tenderloin with paper towels and rub it with 1 TBSP. of extra virgin olive oil. Sprinkle generously with sea salt and pepper.
• Heat one large nonstick skillet over high heat (the size should be large enough to hold the tenderloin.) Add the beef tenderloin and brown on all sides, about 4-5 minutes. Remove from the skillet and place in a roasting pan.
• In a small bowl, mix 3 tablespoons of olive oil, the minced garlic, one tablespoon each of thyme and rosemary. Coat the top and the sides of the tenderloin evenly with Dijon mustard. Then rub the herb mixture on evenly.
• Put on the middle rack in the oven and roast for about 45 minutes. The meat thermometer inserted into the center of the tenderloin should register 125°F for medium-rare. If you prefer it medium-done, cook it a little longer until the temperature registers at 135°F. (An instant-read thermometer (like thermapen) makes this easy.)
• Transfer the tenderloin to a serving platter, cover loosely with foil and let it stand for at least 10 minutes. To serve, slice it thinly, sprinkle with the remaining ½ tablespoon each of thyme and rosemary and serve with balsamic roasted onions on the side.
• For the balsamic onions:
• Position the oven rack in the center of the oven. Preheat to 450°F. Line a large baking sheet with heavy-duty foil.
• Peel and cut the red onions through root end into ¾-inch-thick wedges. Place in a medium bowl and toss with the olive oil. Arrange onions, cut side down, on the baking sheet. Sprinkle generously with salt and pepper. Roast until nice and brown, turning once, about 45 minutes.
• Meanwhile, melt the butter in a small saucepan over medium-high heat. Add the sugar and stir until it dissolves. Remove from the heat and add the balsamic vinegar. Return to the heat and simmer until mixture thickens slightly, about 2 minutes. (The balsamic glaze can be made 1 day ahead).
• To serve, arrange the onions on a platter. Drizzle the glaze over the onions and sprinkle with the minced parsley.