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Pre-heat the oven to 325º.
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Beat the egg yolks until very thick and light-colored.
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Add the orange peel and the juice and continue to beat until very thick.
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Beat in 1 cup of sugar and the salt.
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Gently fold in the flour.
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In a separate bowl, beat the egg whites and cream of tartar until they reach the soft-peak stage.
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Gradually add the remaining 1/2 cup of sugar.
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Gently fold the egg whites into the egg yolk mixture.
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Spoon into ungreased 10-inch tube pan.
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Bake 55 minutes, or till done.
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Invert pan to cool.