In a blender or food processor, liquidize the bananas along with the juice. It should be like a banana puree.
Add the ice cream and cream. This works better if the ice cream isn't too compacted & hard - if necessary break it up a bit with the spoon before adding it. Process until thick and creamy.
Add the spices and blend for a further 30 seconds.
Add the brown sugar and blend for no more than 10 seconds.
Pour into high-ball glasses and serve with straws.
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