Wash the limes and the oranges, cut off and discard the ends. Peel the fruit and discard the pith. Cut the peel into fine shreds. Remove the seeds and tie in a cheesecloth bag. Slice the fruit and put it in a preserving pan with the peel and seeds. Add the water, bring to a boil and simmer 1 hour.
Heat the sugar in a very low oven. Stir it into the fruit and bo