Rinse oysters in collander under clean water. Drain well.
Wash cabbage, then cut into shorter lengths.
Combine potato starch, cornstarch and water, then mix well.
Heat some oil in non-stick pan, add in oysters and stir fry until almost done. Pour in combined starches, fry until slightly set, then pour in beaten egg mixed with cabbages. Turn omlette over and fry until golden brown on both sides.
Heat sauce ingredients until well combined, then thicken with cornstarch solution. Pour over omlette and serve.