Thoroughly wash the strawberries and remove the stems. Set aside a portion of the strawberries for garnish.
Puree the remaining strawberries in a blender until smooth. Add the sugar and blend until completely dissolved.
Soak the gelatin in the water. Gently heat the mixture over low heat until the gelatin is completely dissolved. Then, stir the melted gelatin into the strawberry puree.
In a mixing bowl, whip the heavy cream until stiff peaks form. Gently fold the strawberry-gelatin mixture into the whipped cream, being careful not to deflate the cream.
Place the sponge cake layer in a cake pan. Pour the strawberry mousse evenly over the cake layer. Smooth the top with a spatula.
Refrigerate the cake for at least 4 hours, or until the mousse has set.
Once the cake has set, remove it from the pan and garnish the top with the reserved strawberries. Serve immediately or store in the refrigerator.
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