Drain Pineapple, Reserving Juice; Set Aside. In A Skillet, Stir-Fry Ham Until Golden. In A Bowl, Combine Brown Sugar And Cornstarch. Stir In Water, Vinegar, Mustard And Pineapple Juice Until Blended. Add To The Ham; Bring To A Boil. Reduce Heat; Cook And Stir For 2 Minutes Or Until Thickened And Bubbly. Add Green Pepper And Pineapple; Simmer For 5-8 Minutes. Serve Over Rice.