Christmas Prime Rib

Ingredients

• (6-pound) boneless prime rib roast
• tablespoon sprepared horseradish
• tablespoon sDijon mustard
• teaspoon skosher salt
• teaspoon scoarsely ground black pepper
• teaspoon sdried thyme
• teaspoon sgarlic powder
• stalk scelery, cut into 2-inch piece s
• carrot, cut into 2-inch piece s
• small unpeeled onion, quart ered and separated
• teaspoon sconcentrated beef base (paste)
• 1/2 cup swater
• teaspoon cornstarch
• teaspoon water

Instructions

1. Gather all ingredients. ALLRECIPES / QI AI
2. The day before you plan to serve the prime rib, remove roast from the package and dry thoroughly with paper towels. Set roast on a baking sheet, and place in refrigerator overnight. Remove from refrigerator 1 hour before cooking to allow beef to reach room temperature. ALLRECIPES / QI AI
3. Rub prime rib roast all over with horseradish and Dijon mustard. Mix kosher salt, black pepper, thyme, and garlic powder together in small bowl; sprinkle over roast. ALLRECIPES / QI AI
4. Preheat the oven to 450 degrees F (230 degrees C). Place celery, carrot, and onion into the bottom of a roasting pan; place roast on top. ALLRECIPES / QI AI
5. Roast in the preheated oven for 30 minutes. Reduce oven temperature to 350 degrees F (175 degrees C), and roast until beef is browned and an instant read meat thermometer inserted into the thickest part of the roast reads 130 degrees F (54 degrees C) for medium rare. ALLRECIPES / QI AI
6. Remove from oven, transfer roast to a platter, and cover with a tent of aluminum foil. Allow to rest for 30 minutes. The temperature of the beef will rise about 10 degrees during resting time. ALLRECIPES / QI AI
7. To make au jus sauce: Skim excess fat from pan drippings in the roasting pan. Place the pan over medium heat and stir in beef base and 1 ½ cups of water. Bring to a boil while scraping and dissolving any browned bits from the bottom of the pan. ALLRECIPES / QI AI
8. Strain out and discard vegetables. Combine cornstarch and 1 teaspoon of water in a small bowl until smooth; whisk into sauce. ALLRECIPES / QI AI
9. Allow sauce to thicken slightly; pour into a gravy boat.
10. Serve and enjoy! ALLRECIPES / QI AI