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Prime Rib Roast With Mustard Horseradish Sauce

Source of Recipe

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List of Ingredients

1 (7 lb) standing rib roast (3-rib)
1 1/2 tablespoons kosher salt
2 teaspoons fresh ground black pepper

Mustard Horseradish Sauce:
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

Two hours before roasting, remove the meat from the refrigerator and allow it to come to room temperature.
Preheat the oven to 500 degrees F (see note).
Place the oven rack on the second lowest position.
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.
Roast the meat for 45 minutes.
Without removing the meat from the oven, reduce the oven temperature to 325 degrees F and roast for another 30 minutes.
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.
(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.
Meanwhile, make the sauce.
Remove the roast from the oven and transfer it to a cutting board.
Cover it tightly with aluminum foil and allow the meat to rest for 20 minutes.
Carve and serve with the sauce.
Note: Be sure your oven is very clean before setting it at 500 degrees F.
For Mustard horseradish sauce: Whisk together the mayonnaise, mustards, horseradish, sour cream, and salt/pepper in a small bowl.