In a bowl, combine the cookie crumbs with melted butter and a pinch of salt. Press into the bottom of a 20cm (8-inch) tart pan and refrigerate until firm.
Soak the gelatin sheets in cold water for 5-10 minutes until softened.
In a medium saucepan, caramelize the sugar over medium heat until golden brown. Carefully pour in the heavy cream and stir until the caramel dissolves completely.
Split the vanilla bean lengthwise, scrape out the seeds, and add them to the caramel cream. Bring the mixture to a gentle simmer.
Remove the saucepan from the heat and add the squeezed gelatin sheets. Stir until the gelatin is fully dissolved.
Pour the caramel panna cotta mixture over the chilled cookie crust. Return to the refrigerator for at least 4 hours, or preferably overnight, until completely set.
Before serving, garnish the tart with fresh fruit, a drizzle of caramel sauce, or a sprinkle of sea salt.
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