Prepare the crust: combine the crushed biscuits with the melted butter, press into a springform pan, and refrigerate for 30 minutes.
Soak the gelatin sheets in cold water for 5 minutes to soften.
In a saucepan, heat the heavy cream, milk, and granulated sugar. Split the vanilla bean lengthwise, scrape out the seeds, and add both the seeds and the pod to the mixture.
When the cream mixture is hot but not boiling, remove from heat and stir in the thoroughly squeezed gelatin sheets until dissolved.
Let it cool slightly, then pour over the biscuit base. Return to the refrigerator for at least 4 hours, or until set.
Meanwhile, prepare the raspberry sauce: in a saucepan, bring the raspberries, powdered sugar, lemon juice, and water to a boil. Simmer for 5-7 minutes, or until thickened.
Let the raspberry sauce cool completely, then pour it over the set panna cotta, spreading it evenly.
Refrigerate for another hour to allow the raspberry layer to set.
Carefully remove the cake from the pan, garnish with fresh raspberries, and serve.
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