Steam The Broccoli For 5 To 7 Mins. To Make The Gravy Take The Drippings With Some Beef Stock Or Beef Broth And Thicken With Cornstarch Or Flour, Season With Salt And Pepper. Put The Mushrooms in about 3 mins before serving. For The Mashed Potatoes Take 3 to 4 Potatoes, Boil Till Tender, Add 1\4 Cup Of Cream, 2 Tablespoons Of Butter, 1\3 Cup Of Sour Cream, Salt To Taste. Cook The Prime Rib At 325F Until About 120F On Your Meat Thermometer (For Rare), About 60 Mins.
