Crush the graham crackers and mix them with the melted butter. Press the mixture into the bottom of a cake pan. Refrigerate for 15 minutes.
In a bowl, combine the yogurt with the sugar, lemon juice, and lemon zest.
Prepare the gelatin according to the package instructions, then stir it into the yogurt mixture.
Whip the heavy cream with the powdered sugar until stiff peaks form. Gently fold the whipped cream into the yogurt mixture.
Pour the yogurt mixture over the graham cracker crust and smooth the top. Refrigerate for at least 4 hours, or until set.
Before serving, garnish the cake with fresh lemon slices or lemon zest.
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