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Preheat oven to 350*.
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Grease a 10-inch bundt pan.
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Cream the butter and gradually add the sugar, beating until light.
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Beat in egg yolks, one at a time, and the orange zest.
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Add dry ingredients alternately with the orange juice to the batter.
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Beat the egg whites until stiff and fold them into the batter.
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Pour batter into the prepared bundt pan.
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Bake for 30 to 35 minutes, or until sides of cake shrink away from edges of pan and a cake tester inserted in the center comes out clean.
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Cool for 10 minutes in pan, unmold onto a rack, and drizzle with Orange Glaze while warm.
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Cool before serving.
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Orange Glaze: Combine orange juice and sugar in a small saucepan and simmer gently for 5 minutes, stirring occasionally, until a light syrup forms.