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In a saucepan, whisk together sugar and cornstarch.
Add lemon juice and zest, and stir to combine.
Slowly add chilled cream while whisking continuously.
Heat the mixture over medium heat, stirring constantly until it thickens and starts to bubble.
Remove from heat and let cool completely before using.
Chill in the refrigerator for at least 2 hours to set.
Serving and Storage Tips:
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