Bloom the gelatin in the water, then gently heat over low heat until completely dissolved.
In a large mixing bowl, whip the heavy cream and sugar to stiff peaks.
Gently fold the Nutella into the whipped cream until a smooth and even consistency is achieved.
Add the dissolved gelatin to the Nutella cream and mix thoroughly.
Place the sponge cake base in a cake pan and pour the Nutella cream over it. Smooth the top evenly.
Refrigerate the cake for at least 4 hours, or until the cream has set.
Once the cake is set, remove it from the pan and decorate the top with toasted hazelnuts or melted chocolate. Serve chilled.
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