Bloom the gelatin in the water. Then, gently heat over low heat until completely dissolved.
In a large mixing bowl, whip the heavy cream with the sugar until stiff peaks form.
Gently fold the pistachio cream into the whipped cream until a smooth and homogenous mixture is achieved.
Add the dissolved gelatin to the pistachio cream mixture and stir thoroughly to ensure the cake sets firmly.
Place the sponge cake base into a cake pan and pour the pistachio mousse over it. Smooth the top evenly.
Refrigerate the cake for at least 4 hours, or preferably overnight, to allow the mousse to set completely.
Once the cake has set, remove it from the pan and garnish the top with toasted pistachios. Serve chilled.
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