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Preheat oven to 375°F.
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Add the salt to the egg whites and beat until stiff peaks form.
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Store beaten egg whites in the refrigerator.
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In a large bowl, add the ricotta cheese, sugar, vanilla, orange rind and lemon rind. Mix well.
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In another bowl, beat heavy cream until slightly thick.
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Add it to the ricotta mixture.
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Add the egg whites and gently fold them into the mixture.
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Arrange the pie crust into a deep dish glass pie plate.
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Pour the filling into the dishand bake 15 minutes.
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Turn heat down to 350 and bake for 1 hour, turning the plate around occasionally.
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Remove from oven, let it cool.
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Cover it with plastic wrap and refrigerate it overnight (or at least 4 hours).
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Cut into 10 slices and serve.