""Juicy, tender prime rib roast and delicious gravy."..."
INGREDIENTS
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1 (4.5 pound) beef prime rib roast at room temperature
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coarse sea salt, or as needed
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freshly ground black pepper, or as needed
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1 onion, quartered
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1/4 cup unsalted butter
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1/4 cup all-purpose flour
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1/4 cup red wine
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1 (32 ounce) carton beef stock
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4 sprigs fresh thyme