Combine all ingredients except cornstarch in slow cooker, mix well, cover and cook 7 - 8 hours on low or 4 to 5 hours on high.
2. With slotted spoon, transfer beef and vegetables to a serving bowl and cover to keep warm. Turn slow cooker to high. Combine cornstarch with 2 T. water, mix well. Stir into juices; cover and cook 15 minutes or until thickened. Spoon over beef and vegetables.