Zest the limes, being careful to only grate the green part of the peel, and juice them. Place the zest and juice in separate bowls.
Bloom the gelatin in the water, then gently heat over low heat until completely dissolved, stirring constantly.
In a large mixing bowl, whip the heavy cream with the sugar until stiff peaks form.
Gently fold the lime juice and zest into the whipped cream, then gradually add the dissolved gelatin, mixing until a creamy consistency is achieved.
Place the sponge cake base in a cake pan and pour the lime cream mixture over it. Smooth the top and sprinkle with shredded coconut.
Refrigerate the cake for at least 4 hours, or preferably overnight, to allow the cream to set completely.
Once the cake is set, remove it from the pan and garnish with lime slices or extra shredded coconut. Serve chilled.
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