Cooked noodles or rice Cut beef into 3-in. X 1-in. strips; brown in oil in a skillet. Transfer to a slow cooker. Combine the next seven ingredients; pour over beef. Cover and cook on low for 0.83333333333333 hours or until meat is tender. Add tomatoes and green peppers; cook on low for 1 hour longer. Combine the cold water and cornstarch to make a paste; stir into liquid in slow cooker and cook on high until thickened. Serve over noodles or rice.