FROM THAWED: Thaw in refrigerator.
Oven: Preheat oven to 400 degrees F. Remove thawed roast and juice from package and place in covered pan. Bake for 40-50 minutes.
Microwave: Place frozen roast and packaging upside down in microwave safe dish. Microwave on DEFROST for 30 minutes, turning over half way through cooking. Cut 2 small slits in packaging, microwave on high for 15-17 minutes. Remove from packaging. Slice and serve with au jus.