Soak the gelatin sheets in cold water until softened. Meanwhile, peel and grate the green apples, then toss with lemon juice to prevent browning.
In a medium saucepan, combine the heavy cream, milk, sugar, and vanilla extract. Heat over low heat, stirring until the sugar is completely dissolved, but do not bring to a boil.
Add the grated green apples to the cream mixture and cook for 2-3 minutes to allow the flavors to meld.
Remove the saucepan from the heat and stir in the softened gelatin sheets until completely dissolved in the hot cream mixture.
Strain the mixture through a fine-mesh sieve to remove the apple pieces, ensuring a smooth panna cotta texture.
Pour the mixture into glasses or molds. Let cool to room temperature, then refrigerate for at least 4 hours, or until set.
Before serving, garnish with thin slices of green apple or a sprinkle of lemon zest.
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