Prime Rib Foolproof with Au Jus Gravy Recipe

Ingredients

• 5 pounds Bone-in prime rib roast
• 2 tablespoons Kosher salt
• 2 tablespoons Black pepper, freshly ground
• 1 tablespoon Garlic powder
• 2 tablespoons Olive oil
• 2 tablespoons Unsalted butter
• 1 medium Onion, chopped
• 2 medium Carrots, chopped
• 2 stalks Celery, chopped
• 4 cups Beef broth
• 1 cup Red wine (optional)
• 4 sprigs Fresh thyme
• 2 sprigs Fresh rosemary
• 2 tablespoons All-purpose flour