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Beat eggs thoroughly.
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Strain through wire strainer, into a bowl, and set aside.
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Shred, very finely, 1/3 cup zest from limes.
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Squeeze the juice from limes to make 1-2/3 cups liquid.
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Put sugar and butter in upper part of double boiler, set over simmering water.
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Stir together until butter is melted.
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Add lime juice, zest, and eggs to butter mixture.
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Cook, stirring frequently until white foam is absorbed from the surface, and mixture thickens to consistency of a light custard (approx. 15 minutes).
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Spoon hot curd into warm jars, cool slightly, and seal with lid.
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Refrigerate.
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