INGREDIENTS
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1 (3-rib) standing rib roast (7 to 8 pounds)
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1 tablespoon kosher salt
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1 1/2 teaspoons freshly ground black pepper
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Mustard Horseradish Sauce, recipe follows
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1 1/2 cups good mayonnaise
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3 tablespoons Dijon mustard
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1 1/2 tablespoons whole-grain mustard
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1 tablespoon prepared horseradish
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1/3 cup sour cream
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1/4 teaspoon kosher salt