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Stir together eggs, sugar and lemon juice in a medium saucepan.
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Cook over medium-low heat, stirring constantly with a wooden spoon, until slightly thickened, about 2 minutes.
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Raise heat, continue to cook, continue stirring, about 5 more minutes.
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Strain through a sieve.
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Cover and refrigerate, 45 minutes.
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Whisk heavy cream until soft peaks form.
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Fold cream into lemon mixture.
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Cover and refrigerate (30 minutes, up to 2 days).