Directions

1. Place a large piece of heavy-duty foil (21-in. x 17-in.) in a shallow roasting pan. Place roast on foil. Pour 1 cup water and mushrooms over roast. Sprinkle with soup mix. Wrap foil around roast; seal tightly. Bake at 350 degrees F for 2-1/2 to 3 hours or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145 degrees F; medium, 160 degrees F; well-done, 170 degrees F).
2. Remove roast to a serving platter and keep warm. Pour drippings and mushrooms into a saucepan. Combine cornstarch and remaining water until smooth; gradually stir into drippings. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with slice beef.