Cast Iron Skillet Prime Rib Roast and Gravy
Ingredients
- 1 beef prime rib roast at room temperature
- coarse sea salt
- freshly ground black pepper
- 1 onion quartered
- 1/4 cup unsalted butter
- 1/4 cup all purpose flour
- 1/4 cup red wine
- 1 carton beef stock
- 4 sprigs fresh thyme
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