Stir together lemon-flavored gelatin and 2 cups boiling water in a large bowl until dissolved. Chill 1 hour or until consistency of unbeaten egg whites. Whisk in lemon pie filling and whipped topping until smooth. Fold in pineapple and lemon rind; spoon mixture into a lightly greased 2-quart mold or serving dish. Chill 8 hours or until firm.