1. Dredge the pork cubes in the cornstarch and brown on all sides in a frying pan in oil on your conventional burner. Do not put too many pieces in at once. Drain on paper toweling and set aside.
2. Put the 2 tablespoons pineapple juice, butter, ginger and carrot in a large covered casserole and cook, covered, in the microwave oven for 3 minutes.
3. Stir in the celery, onion, green pepper and mushrooms. Cook, covered, 3 minutes in the microwave oven.
4. Add the pork and all the other ingredients. Stir well. Continue cooking, covered, in the microwave oven, stirring from time-to-time, until the sauce is thickened and the food is piping hot. Season to taste.