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Roasted Beef Tenderloin with French Onions

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This roasted beef tenderloin with French onions is the ultimate main course for special occasions. Juicy, tender beef cooked to a perfect medium-rare is paired with rich, caramelized French onions for an elegant yet comforting dish. Whether you’re hosting a holiday dinner or celebrating a milestone, this roasted beef tenderloin with French onions is sure to impress.

  • Author: Julia
  • Prep Time: 20 minutes
  • Cook Time: 40–50 minutes
  • Total Time: 1 hour 15 minutes
  • Yield: Serves 6–8
  • Category: Main Course
  • Method: Roasting
  • Cuisine: American / French-inspired
  • Diet: Gluten Free

Ingredients

  • 1 center-cut beef tenderloin roast, trimmed
  • Kosher salt, to taste
  • Freshly ground black pepper, to taste
  • 2 tbsp olive oil or neutral cooking oil
  • 2–3 cloves garlic, minced
  • 2–3 sprigs fresh thyme or rosemary
  • 2 tbsp butter
  • 3–4 yellow onions, thinly sliced
  • ½ cup beef broth or stock
  • 1 tbsp balsamic vinegar or dry sherry (optional)

Instructions

  1. Season the beef tenderloin generously with salt and pepper. Let sit at room temperature for 30–45 minutes.
  2. Preheat oven to 425°F (220°C).
  3. In a large skillet over medium-high heat, sear the tenderloin on all sides in hot oil until browned.
  4. Transfer to a wire rack in a roasting pan. Roast for 25–35 minutes, or until internal temperature reaches 125°F (52°C) for medium-rare.
  5. While the beef roasts, cook the sliced onions in butter over low heat, stirring often, until caramelized (30–40 minutes).
  6. Deglaze the onion pan with balsamic vinegar or sherry (if using), add beef broth, and let reduce slightly.
  7. Let the beef rest for 10–15 minutes before slicing. Serve with a generous spoonful of French onions on top.

Notes

  • Use a meat thermometer to ensure perfect doneness.
  • Make the onions ahead of time and reheat before serving.
  • Add garlic-herb butter or Dijon mustard to the rub for flavor variations.
  • Pairs well with mashed potatoes, roasted veggies, or salad.

Nutrition

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