Roasted Beef Tenderloin with French Onions and Horseradish Sauce

This Roasted Beef Tenderloin with French Onions and Horseradish Sauce is an elegant and flavorful centerpiece for any special occasion. The tenderloin is perfectly roasted to a juicy medium-rare, topped with caramelized French onions, and served with a creamy, tangy horseradish sauce that adds the perfect kick.

Ingredients

For the beef tenderloin:
1 whole beef tenderloin (about 3 to 4 pounds), trimmed
2 tablespoons olive oil
2 teaspoons kosher salt
1 teaspoon black pepper
1 teaspoon garlic powder
1 teaspoon dried thyme
2 tablespoons butter
2 sprigs fresh thyme (optional, for garnish)

For the French onions:
2 large yellow onions, thinly sliced
2 tablespoons butter
1 tablespoon olive oil
1/4 teaspoon salt
1/2 teaspoon sugar

For the horseradish sauce:
1/2 cup sour cream
2 tablespoons prepared horseradish
1 teaspoon Dijon mustard
1 teaspoon white vinegar
Salt and pepper to taste

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