INGREDIENTS
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1 (7-lb.) 4-bone prime rib roast, chine bone removed
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1/3 cup Dijon mustard
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3 garlic cloves, minced
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1 tablespoon chopped fresh rosemary
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2 tablespoons olive oil
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7 teaspoons kosher salt
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2 1/4 teaspoons freshly ground black pepper
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2 tablespoons butter
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2 (8-oz.) packages fresh mushrooms, quartered
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2 shallots, minced
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1/2 cup dry red wine
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1 cup beef broth