Soak the gelatin sheets in cold water until softened.
In a medium saucepan, heat the heavy cream with the sugar and the seeds scraped from the vanilla bean. Slowly bring to a simmer, allowing the flavors to infuse.
Remove the saucepan from the heat and stir in the squeezed gelatin sheets until completely dissolved.
Pour the cream mixture into clear glasses or ramekins and let cool to room temperature. Then, refrigerate for at least 2 hours to set.
Prepare the grape jelly: combine the fresh grape juice with a little sugar and heat gently. Add the remaining softened gelatin sheets and stir until completely dissolved. Let cool slightly.
Pour the grape jelly over the panna cotta and refrigerate for another 2 hours to set completely.
Before serving, garnish the panna cotta with fresh grapes and a mint leaf for an appealing presentation.
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