In A Skillet, Brown Steak In Oil; Transfer To A Slow Cooker. In The Same Skillet, Saute Onion For 1 Minute. Gradually Add Water, Stirring To Loosen Browned Bits From Pan. Add Remaining Ingredients; Bring To A Boil. Pour Over The Flank Steak. Cover And Cook On Low For 7-8 Hours Or Until The Meat Is Tender. Slice The Meat; Serve With Onion And Pan Juices.