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In a large bowl, cream together the brown sugar and margarine.
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Line a 10 inch' square baking tin with greaseproof paper and spread the butter and sugar mix on the base of the tin, press rings of pineapple into the mix and half where necessary to fill the gaps, pop a glace cherry in the centre of each ring.
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Cream margarine and caster sugar and then alternately add some gluten free flour and an eggs, beating between each addition until all the gluten free flour and eggs have been added, then beat in the reserved pineapple juice from the can to the cake mix.
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Spoon the mix on top of the pineapple and spread over. Bake on gas mark 5/190c for 40-50 mins until golden and skewer comes out clean.
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Remove from oven and allow to cool for 5-10 mins before turning out and removing the greaseproof, the bottom now becomes the top.
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Slice into 9 pieces and serve!