""Delicious coating on outside of roast, and perfect roasting time. Plan on 1 pound per person."..."
INGREDIENTS
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1 (6 pound) boneless prime rib roast 2 tablespoons prepared horseradish
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2 tablespoons Dijon mustard
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2 teaspoons kosher salt
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2 teaspoons coarsely ground black pepper
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2 teaspoons dried thyme
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2 teaspoons garlic powder
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2 stalks celery, cut into 2-inch pieces
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1 carrot, cut into 2-inch pieces
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1 small unpeeled onion, quartered and separated
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2 teaspoons concentrated beef base (paste)
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1 1/2 cups water
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1 teaspoon cornstarch
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1 teaspoon water