Combine the crushed graham crackers with the melted butter, then press into the bottom of a 20 cm (8-inch) springform pan. Refrigerate for 15 minutes to set.
In a mixing bowl, whip the heavy cream until stiff peaks form. Set aside.
In another bowl, combine the mascarpone cheese, powdered sugar, lemon juice, and lemon zest. Mix until smooth and creamy.
Dissolve the gelatin in a small amount of hot water, then let it cool slightly. Once it has cooled to room temperature, stir it into the mascarpone mixture.
Gently fold the whipped cream into the lemon cream until just combined, being careful not to deflate the cream.
Pour the lemon cream over the graham cracker crust, smooth the top, and refrigerate the cake for at least 4 hours, or preferably overnight, to set.
Before serving, garnish with fresh lemon slices, lemon zest, or a clear glaze on top.
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