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Put 100ml of water in a pan and add 100g of sugar. 
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Gently heat to disolve the sugar. 
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Squeeze the juice from the fruit and retain for other use. 
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Slice and chop the skins.  I is not necessary to remove the pith. 
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Place in the heated water and sugar. 
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Simmer for 30 minutes until translucent and soft. 
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Leave to cool in the syrup and then spread on grease proof paper to cool. 
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Place in an airtight container in the fridge.