Just discovered this and wanted to share. All you need is frozen banana and a good strong blender. Over ripe bananas are probably the best. Freeze the bananas in about 2-3cm slices. Once frozen, just add to the blender and persevere. You will need to keep pushing the banana pieces down with a wooden spoon or other implement and keep blending. At first it will very lumpy and sticky. Keep going though and eventually it will ''turn'' into something like soft serve ice cream. Can be eaten like this or frozen again for a harder ice cream later.