This section is from the book "Miss Leslie's Complete Cookery", by Miss Leslie. Also available from Amazon: Miss Leslie's Complete Cookery.
Take ripe barberries, and having stripped them from the stalks, mash them, and boil them in their juice for a quarter of an hour. Then squeeze them through a bag: allow to each pint of juice, a pound of loaf-sugar; and having melted the sugar in the juice, boil them together twenty or twenty-five minutes, skimming carefully. Put it up in tumblers with tissue paper.
 
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