Melt the dark chocolate in a double boiler, then let it cool to room temperature.
Dissolve the instant coffee powder in hot water and let it cool completely.
Soak the gelatin in cold water, then gently heat it 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 melted chocolate and coffee solution into the whipped cream, then add the dissolved gelatin.
Place the sponge cake base in a cake pan and pour the coffee chocolate mousse over it. Spread the top evenly.
Refrigerate the cake for at least 4 hours, or preferably overnight, to allow the mousse to set completely.
Once the cake has set, remove it from the pan and decorate the top with coffee beans or cocoa powder. Serve chilled.
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