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Preheat oven to 350 degrees.
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Beat egg yolks until slightly thickened.
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Gradually add 3/4 cup of sugar and hot water to yolks, beating until thick and lemon colored.
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Blend in orange juice, vanilla, orange and lemon peels.
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Sift together cake flour, baking powder and salt.
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Add to wet ingredients.
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In a separate bowl, beat egg whites until soft peaks form.
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Add remaining 1/4 cup sugar, a tablespoon at a time until stiff peaks form.
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Fold 1/4 of the egg white mixture into batter until incorporated. Fold in remaining egg whites.
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Spoon into an ungreased 10 inch tube pan.
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Bake at 350 degrees for 20-25 minutes, or until cake springs bake when pressed lightly.
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Immediately invert pan and cool.