Sift the flour and baking powder into a large bowl. Stir in the sugar, coconut, lime zest and salt. Stir the mashed bananas into the dry ingredients, mixing until well combined. Cover the batter with cling film and chill for 15 minutes.
Fill a large saucepan one-third full of vegetable oil and heat to 180c, or until a cube of bread dropped in the oil sizzles and turned golden in 30 seconds.
Using a tablespoon, carefully drop 4 or 5 spoonfuls of the batter into the hot oil and fry for 2-3 minutes, until golden brown on both sides and cooked through
Lift out with a slotted spoon, drain on kitchen paper, and repeat with the rest of the mixture. Serve hot, sprinkled with a little sugar.
