Put two and a half pounds of blackcurrants in a large pan with four litres of water and bring to the boil. Boil for fifteen minutes.
Strain off the fruit. Add fifteen cups of the liquid, one cup of wine vinegar and thirteen cups of sugar. Allow the sugar to dissolve and boil for three minutes. Allow to cool and then bottle.
We keep some in the fridge and freeze the rest for use later in the year.
Dilute to taste with either ordinary or sparkling water. Cheers!