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If you don't have an ice cream maker, chop the banana into small chunks and freeze beforehand. When blending everything, do it really thoroughly to get lots of air in, then pour into a suitable container and freeze for about 2 hours.
Texture won't be quite as good, but taste will be the same.
Variation - Use coconut milk instead of the soya cream.
posted by Ronny/Capybara Moonc