Place Potatoes And Water In A 3-Qt. Microwave-Safe Bowl. Cover; Microwave On High For 6-8 Minutes. Add The Onion; Cover And Cook For 4 Minutes. Stir In The Coleslaw Mix. Cover And Cook For 3-4 Minutes Or Until Potatoes Are Tender; Drain. In A Large Skillet, Saute The Corned Beef In Oil For 3-4 Minutes; Stir In The Remaining Ingredients. Cook And Stir For 1 Minute Or Until Heated Through. Add To The Potato Mixture; Toss To Combine. Cover And Microwave For 2-3 Minutes Or Until Heated Through. Serve Immediately.