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In a medium-size, heavy saucepan, combine the sugar, cornstarch, and salt.
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Mix well and then gradually stir in the water.
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Cook the mixture over low heat until bubbly and thick, stirring constantly.
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In a small bowl, beat the egg yolks until frothy.
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Then, stirring constantly, add a few tablespoons of the hot sugar mixture to the yolks.
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Stirring constantly, pour the egg mixture into the hot sugar mixture and continue to cook, stirring, for 1 minute.
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Remove the pan from the heat.
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Add the butter and lemon rind and juice.
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Stir until well blended.
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Serve the sauce hot or cold.
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Keeps in a tightly covered container in the refrigerator for up to 1 week.