Dice the eggplant into 5 mm cubes and soak in water for 5 minutes. Drain well.
Dice the cucumber, myoga, ginger, and shiso into 5 mm pieces.
Boil the okra for 1 minute, cool in ice water, then dice into 5 mm pieces.
Add all the vegetables to a bowl. Pour in the seasonings and mix well until everything is evenly coated.
Cover and refrigerate overnight before serving.
