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Roasted Beef Tenderloin with French Onion Au Jus

Roasted Beef Tenderloin with French Onion Au Jus

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Instructions

Step 1: Prep and Season the Beef

  1. Preheat oven to 425°F (220°C).
  2. Pat the beef tenderloin dry and tie it with butcher’s twine to ensure even cooking.
  3. Rub all over with olive oil, then season generously with salt, pepper, garlic, rosemary, and thyme.

Step 2: Sear the Beef

  1. Heat a large oven-safe skillet (like cast iron) over high heat.
  2. Sear the tenderloin on all sides until nicely browned (about 3–4 minutes per side).
  3. Transfer the skillet to the oven and roast for 25–35 minutes, or until the internal temperature reaches:
    • 120–125°F for rare
    • 130°F for medium-rare
    • 135°F for medium
  4. Remove from oven, tent with foil, and rest for 15 minutes before slicing.

Step 3: Make the French Onion Au Jus

While the beef is roasting or resting, make the au jus:

  1. In a saucepan, melt butter over medium heat. Add the sliced onions and cook slowly, stirring often, for 20–25 minutes until caramelized.
  2. Add brown sugar and balsamic vinegar, and stir to deglaze the pan.
  3. Pour in beef broth and Worcestershire sauce. Add a splash of wine if desired.
  4. Simmer for 10–15 minutes until slightly reduced and flavorful. Season to taste with salt and pepper.

Serving Suggestions

  • Slice beef tenderloin into medallions and spoon warm French onion au jus over the top.
  • Serve with mashed potatoes, roasted root vegetables, or creamy polenta.
  • Garnish with fresh thyme or parsley for a finishing touch.

Tips for Success

  • 🥄 Rest the beef before slicing to retain juices and tenderness.
  • 🌡️ Use a meat thermometer for perfect doneness—tenderloin can overcook quickly.
  • 🧅 Caramelize onions slowly for the deepest flavor—rushing this step compromises the sauce.
  • 🍷 Deglaze with wine for an extra layer of flavor (just a splash will do).

Variations

  • Herb crust: Add Dijon mustard to the beef before roasting and roll in fresh herbs for a flavorful crust.
  • Cheesy twist: Top sliced beef with gruyère shavings to echo the classic French onion soup experience.
  • Add mushrooms: Sautéed mushrooms make a great addition to the au jus.

Final Thoughts

Roasted Beef Tenderloin with French Onion Au Jus is the kind of dish that feels both luxurious and comforting. With just a handful of ingredients and careful technique, you can serve a meal that rivals fine dining without leaving your kitchen. Perfect for holidays, anniversaries, or any night you want to celebrate in style.

Tried this recipe? Let us know how it turned out—or what special occasion you served it for!