Drain pineapple, save juice and add water to make 2 cups. In saucepan melt butter and add green pepper, celery, onion, and saut� 2-3 minutes. Stir in brown sugar, corn starch, and salt. Remove from heat and stir in soy sauce, Worcestershire sauce and 2 cups liquid. Cook over medium heat, stirring constantly until thick. Add pineapple, pour over chicken and bake 1 hour and 15 minutes (uncovered) 190ºC oven.