One 3-rib standing rib roast (7 to 8 pounds)
1 tablespoon kosher salt
1 1/2 teaspoons freshly ground black pepper
Mustard Horseradish Sauce, recipe follows
1 1/2 cups good mayonnaise
3 tablespoons Dijon mustard
1 1/2 tablespoons whole-grain mustard
1 tablespoon prepared horseradish
1/3 cup sour cream
1/4 teaspoon kosher salt
Be sure your oven is very clean before setting it at 500 degrees F.