Soak the gelatin sheets in cold water until softened.
In a medium saucepan, heat the heavy cream with the sugar, seeds scraped from the vanilla bean, and fresh mint leaves. Bring to a gentle simmer to infuse the flavors.
Add the lemon juice and lemon zest to give a fresh, bright flavor to the mixture.
Remove the saucepan from the heat and strain out the mint leaves. Then, stir in the squeezed-out gelatin sheets until completely dissolved.
Pour the mixture into clear glasses and let cool to room temperature, then refrigerate for at least 4 hours to set.
Before serving, garnish the panna cotta with fresh mint leaves and a thin lemon slice.
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