Prime Rib | Command Cooking

Ingredients

• 1 (6 pound) prime rib roast, boneless
• 2 tablespoons prepared horseradish
• 2 tablespoons Dijon mustard
• 2 teaspoons kosher salt
• 2 teaspoons coarsely ground black pepper
• 2 teaspoons dried thyme
• 2 teaspoons garlic powder
• 2 stalks celery, cut into 2-inch pieces
• 1 carrot, cut into 2-inch pieces
• 1 small onion, unpeeled, quartered, and separated
• 2 teaspoons concentrated beef base paste
• 1 1/2 cups plus 1 teaspoon water
• 1 teaspoon cornstarch