Roasted Beef Tenderloin - Farragut Life

Ingredients

• 3 lbs whole, trimmed beef tenderloin
• ½ cup olive oil, divided
• 1 salt, to taste
• 1 tbsp granulated garlic
• 3 tbsp cracked black pepper, divided
• 1 thyme leaves, for garnish
• 1 chopped parsley, for garnish
• 2 lbs thinly sliced onions
• 4 tbsp butter
• 1 tsp chopped, fresh thyme
• 1 tsp chopped, fresh rosemary
• 1 bay leaf
• ¼ cup rice wine vinegar
• ⅔ cup mayonnaise
• ⅔ cup sour cream
• 3 oz prepared horseradish
• ½ tsp lemon, zest and juice