Prepare the bananas: peel and slice them thinly. Set aside a few slices for decoration.
In a saucepan over low heat, melt the sugar until it turns into caramel. Be careful not to burn it.
Once the caramel is golden brown, add the butter and stir until smooth. Then, slowly pour in the heavy cream, stirring constantly, to create a smooth caramel sauce.
Soak the gelatin in water, then heat over low heat until completely dissolved. Stir it into the caramel sauce.
Place the sponge cake base in a cake pan and layer the banana slices on top. Pour the caramel cream evenly over the bananas.
Refrigerate the cake for at least 4 hours, or until the cream has set.
Once the cake has set, remove it from the pan and decorate the top with the reserved banana slices. Serve chilled or store in the refrigerator.
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