Put the bananas, rice flour, plain flour, sugar, oil, cardamom and pinch of salt in a large bowl. Make a well in the centre and pour in 100ml/3 1⁄2floz water. Blend with a wooden spoon to form a thick batter, adding a little more water or flour if required.
Heat a frying pan over a medium heat. Rub the surface with some oil using a brush or kitchen paper.
Pour a large spoonful of the batter into the pan, and spread it out lightly. Cook for 5 minutes or until golden brown underneath, then turn over and cook for a further 3 minutes. Continue until all the batter has been used.
Serve hot with ice cream.