Mushroom Gravy

Use the roasting pan from the prime rib roast and drain all but 3 Tbsp (45 mL) drippings. Over medium heat, sauté mushrooms in the drippings until soft, about 8 minutes. Add flour and cook over medium heat 3 minutes until flour is worked into a paste. Add red wine gradually, whisking in slowly to avoid lumps. Add water or broth and bring to a boil, stirring often. Simmer 5 minutes, season to ta