Zest the limes, then juice them to obtain fresh lime juice.
In a bowl, whisk the egg yolks and powdered sugar together until light and fluffy.
In a small saucepan, heat the lime juice over medium heat. Once it begins to simmer, slowly pour it into the egg yolk mixture while continuously whisking to prevent the eggs from scrambling.
Return the lime-egg yolk mixture to the saucepan and cook over low heat, stirring constantly, until the mixture thickens slightly and becomes creamy.
In a separate bowl, whip the heavy cream to stiff peaks. Be careful not to overwhip, as you want a creamy consistency.
Gently fold the whipped cream into the lime mixture. Use a spatula and be careful not to deflate the cream, maintaining its light and airy texture.
Pour the mixture into a serving dish or a silicone mold and place it in the freezer. Freeze for at least 4-6 hours, but the flavors will meld even better if allowed to rest overnight.
Remove the parfait from the freezer 5 minutes before serving to make it easier to slice. Dip a knife in warm water for clean slices.
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