Soak the gelatin sheets in cold water for 5 minutes, or until softened.
In a saucepan, combine the heavy cream, milk, sugar, and the seeds scraped from the vanilla bean. Heat over low heat, stirring until the sugar is completely dissolved, but do not boil.
Squeeze out the excess water from the softened gelatin sheets, then add them to the warm cream mixture. Stir until the gelatin is completely dissolved.
Let it cool slightly, then stir in the lychee purée to preserve the fruit's freshness.
Strain the mixture through a fine-mesh sieve to remove any vanilla bean particles, then pour into small molds or glasses.
Let cool to room temperature, then refrigerate for at least 4 hours, or until completely set.
Before serving, garnish with fresh lychees and, if desired, a drizzle of lychee syrup for extra flavor.
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