Oil, for stir-frying. NOTE (sprinkle the apples with a 2 Tablespoon of lemon juice...it will keep them from discoloring) Heat the oil in the wok/skillet and add the chicken. Stir-fry until cooked (about 3-5 minutes, it may be easier if you do it in halves). Add in green pepper and celery, stir-fry for another few minutes. Add apples and heat until they are warm. Stir in the yogurt and the spices. Heat until everything is hot, serve over rice with more apples, bananas, rasins, peanuts, grapes, chutney, sesame seeds or whatever else strikes your fancy. This is a fairly mild, sweet curry.