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Roasted Beef Tenderloin with French Onion Au Jus: A Show-Stopping, Flavor-Packed Main Course

When it comes to a special occasion dinner or a holiday feast, nothing says elegance quite like a perfectly Roasted Beef Tenderloin. But take it up a notch by pairing it with a rich, deeply savory French Onion Au Jus, and you’ve got a dish that’s truly unforgettable.

This recipe combines the luxurious tenderness of beef tenderloin with the sweet, caramelized depth of classic French onion flavors. The result is a restaurant-worthy main course that’s surprisingly doable in your home kitchen.

Why You’ll Love This Recipe

🥩 Melt-in-your-mouth beef – tenderloin is prized for its buttery texture
🧅 Rich onion jus – slow-cooked onions and beef drippings create a bold, savory sauce
🍷 Elegant and impressive – perfect for dinner parties, holidays, or celebrations
🕒 Surprisingly quick cook time – beef tenderloin roasts in under 40 minutes
🥄 Minimal ingredients, maximum flavor

Ingredients

For the Roasted Beef Tenderloin:

1 whole beef tenderloin (about 3–4 lbs), trimmed and tied
2 tablespoons olive oil
2 teaspoons kosher salt
1 teaspoon black pepper
1 tablespoon fresh rosemary, finely chopped
1 tablespoon fresh thyme, finely chopped
3 cloves garlic, minced

For the French Onion Au Jus:

2 tablespoons unsalted butter
2 large yellow onions, thinly sliced
2 teaspoons brown sugar
2 teaspoons balsamic vinegar
1 teaspoon Worcestershire sauce
2 cups beef broth (preferably low sodium)
Salt and black pepper, to taste
Optional: a splash of dry white wine or sherry
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