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Preheat oven to 350*.Grease and flour 10" bundt pan.set aside.
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FOR CAKE:.
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empty cake mix into large bowl, add water to orange juice to equal 1 /3 cups liguid.
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Add liguid, eggs, orange peel to mix.
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Beat at medium speed with electric mixer for 2 minutes.
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Bake and cool cake following package directions.
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Sift powdered sugar over cooled cake.
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FOR TOPPING:.
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drain mandarin oranges, reserving juice. Drain pineapple, reserving juice.
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Combine juices in 1 cup measure.Add water or orange juice to fruit juices to equal 1 cup.
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Pour into small saucepan.
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Combine granulated sugar and cornstarch.
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Stir into liquid.
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Cook on medium heat, stirring constantly, until thickened.
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Add butter, if desired. Stir until melted.Cool.
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Stir mandarin orange, pineapple and banana into cooled sauce.
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Cut cake into 16 servings.
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Spoon sauce over each serving --
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Sprinkle with coconut, if desired.