by Monica Shaw
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cider vinegar, or wine vinegar
Weigh the blackberries, then add to a large container with an equal quantity of vinegar. Allow the mixture to steep 7-10 days, covered. Strain the mixture, reserving the liquid
Add the liquid to a saucepan with 450g of sugar per 700ml of liquid. Bring to the boil, then cook at a boil for 8-10 minutes
Transfer to sterilized bottles and enjoy!