Peel the mango, remove the kernel and put the flesh in a blender. Add the sugar, the brown sugar and the juice of lime and reduce the flesh mashed up to the dissolution of grains of sugar. Distribute the mango puree in lenses and put in the refrigerator. In a kettle, heat the coconut milk certified with the sugar and rum. Bring to a boil and then set aside. Dilute to cold gelatine certified with a little water. Mix the gelatin coconut milk warm. Stir well. Allow to cool for 2 to 3 minutes. Pour the coconut milk gelled on the mango puree and put the lenses in the refrigerator for at least 2 hours.