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Cream the margarine and sugar together in a large bowl.
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Using a fork, mash the banana on a plate on in a bowl and then add to the creamed mix.
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Add the eggs and gluten free flour alternately and beat in between each part until all mixed together then stir in the coconut.
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Grease and line a 2lb loaf tin and pour in the cake batter, bake on gas 5/190c for 50 mins -1 hour, until a skewer comes out clean.
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Remove from the tin and allow the cake to fully cool before icing.
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Mix the icing sugar with the lime juice and a little water until a spreadable paste.
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Toast the desiccated coconut this can be done by either frying in a frying pan for a few mins or place on tin foil under the grill, toast until lightly browned, be careful not to burn it.
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Spread the icing over the cake then scatter of the coconut, let the icing set before serving.