Cut pineapple in half lengthwise through crown. With sharp knife, remove pineapple flesh in chunks. Trim and discard core. Reserve shells. In medium bowl combine pineapple, orange sections, 1/4 cup liqueur and orange peel; mix well. Chill several hours, stirring occasionally to blend flavors. Just before serving, stir in banana slices. Spoon into reserved pineapple shells. Heat remaining 1/4 cup liqueur, ignite with a match and pour over fruit.
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