Thoroughly wash the raspberries, and set aside a few of the most beautiful ones for decoration.
Puree the raspberries using a blender, then strain through a fine-mesh sieve to remove the seeds.
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 raspberry puree and the dissolved gelatin into the whipped cream until you have a uniformly pink raspberry mousse.
Place the sponge cake base in a cake pan and pour the raspberry mousse over it. Spread the top evenly.
Refrigerate the cake for at least 4 hours, or until the mousse is completely set.
Once the cake is set, remove it from the pan and decorate the top with the reserved raspberries. Serve chilled.
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