Cast-Iron Skillet Prime Rib Roast and Gravy

Cast-Iron Skillet Prime Rib Roast and Gravy was pinched from <a href="http://allrecipes.com/Recipe/Cast-Iron-Skillet-Prime-Rib-Roast-and-Gravy/Detail.aspx" target="_blank">allrecipes.com.</a>

""Juicy, tender prime rib roast and delicious gravy."..."

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