Prime Rib Roast With Mustard Horseradish Sauce

Total Time: 1 hr 30 mins Preparation Time: 25 mins Cook Time: 1 hr 5 mins

Ingredients

• Servings: 6
• 1 (7 lb) standing rib roast (3-rib)
• 1 1/2 tablespoons kosher salt
• 2 teaspoons fresh ground black pepper
• 1 1/2 cups mayonnaise
• 2 tablespoons dijon mustard
• 2 1/2 tablespoons whole grain mustard
• 2 tablespoons prepared horseradish
• 1/3 cup sour cream
• 1/4 teaspoon kosher salt
• 1/2 teaspoon black pepper

Recipe

• 1 two hours before roasting, remove the meat from the refrigerator and allow it to come to room temperature.
• 2 preheat the oven to 500 degrees f (see note).
• 3 place the oven rack on the second lowest position.
• 4 place the roast in a pan large enough to hold it comfortably, bone-side down, and spread the top thickly with the salt and pepper.
• 5 roast the meat for 45 minutes.
• 6 without removing the meat from the oven, reduce the oven temperature to 325 degrees f and roast for another 30 minutes.
• 7 finally, increase the temperature to 450 degrees f and roast for another 15 to 30 minutes, until the internal temperature of the meat is 125 degrees f.
• 8 (be sure the thermometer is exactly in the center of the roast.) the total cooking time will be between 1 1/2 and 1 3/4 hours.
• 9 meanwhile, make the sauce.
• 10 remove the roast from the oven and transfer it to a cutting board.
• 11 cover it tightly with aluminum foil and allow the meat to rest for 20 minutes.
• 12 carve and serve with the sauce.
• 13 note: be sure your oven is very clean before setting it at 500 degrees f.
• 14 for mustard horseradish sauce: whisk together the mayonnaise, mustards, horseradish, sour cream, and salt/pepper in a small bowl.