Soak the gelatin in 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 and rosewater into the whipped cream until you have a smooth and fragrant cream.
Add the dissolved gelatin to the pistachio-rosewater cream and mix thoroughly.
Place the sponge cake base in a cake pan and pour the cream over it. Spread the top evenly.
Refrigerate the cake for at least 4 hours to allow the cream to set.
Once the cake is set, remove it from the pan and garnish with toasted pistachios and rose petals. Serve chilled.
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