Soak the gelatin sheets in cold water for 5 minutes to soften.
In a saucepan, heat the heavy cream, milk, and granulated sugar over medium heat, but do not bring to a boil.
Slice the vanilla bean in half lengthwise and scrape out the seeds. Add the seeds to the cream mixture.
Remove from heat, squeeze out any excess water from the gelatin sheets, and stir them into the warm cream mixture until completely dissolved.
Pour the panna cotta into small glasses or molds, then refrigerate 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 simmer, then cook for 5-7 minutes, or until thickened.
Let the raspberry sauce cool, then spoon it over the panna cotta before serving.
Garnish with fresh raspberries and a few mint leaves, if desired.
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