Pour the sugar and water into a saucepan on medium heat. Let the sugar dissolve and add the berries. Simmer for 5 minutes, then add the vinegar, bring it to the boil and remove from the heat. Pour into a clean container, seal and leave in the refrigerator for 3 days. Strain and store in Kilner jars until ready to use.
Use equal quantities of elderberry vinegar and rapeseed oil to make a