Best Beef Tenderloin with Creamy Mustard Sauce recipe - from the TRIED & TRUE Volume 2 Family Cookbo

Ingredients

• 1 tablespoon vegetable oil
• 1 tablespoon chopped fresh thyme leaves
• 3 cloves garlic, minced
• 1 (3-pound) beef tenderloin, trimmed and tied into 2-inch sections
• 2 teaspoons kosher salt
• 2 teaspoons ground black pepper
• For the creamy mustard sauce:
• 3/4 cup sour cream
• 1/4 cup whole grain Dijon mustard
• 1 tablespoon horseradish, or more, to taste
• 2 tablespoons chopped fresh chives
• Kosher salt and freshly ground black pepper, to taste