Sugared coconut: Heat the sugar and water to 117°C then add the toasted grated coconut and stir until evenly coated and the sugar has re-crystallized.Leave to cool.
Crisp: Melt the cocoa butter and white chocolate couverture and combine. Add the sugared coconut. Spread between two baking papers.
Be careful not to overcook the bananas so that they don't stew.