Trim fat from steak; cut steak into 1 1/2-inch pieces. Place steak in a 4-quart electric slow cooker. Add flour and pepper; toss. Add tomato and next 4 ingredients; stir well.
Cover with lid; cook on high-heat setting for 1 hour. Reduce heat setting to low; and cook 7 hours or until steak is tender, stirring once. To serve, spoon meat mixture evenly over rice.
Tip: Using an electric slow cooker is like having a personal chef, but cheaper. Just throw some ingredients into the pot, go to work, and come home to a hot meal.