Rinse berries and fill canning jars 3/4 full with the berries.

Bring white wine vinegar to a boil and top up jars, placing a small piece of plastic over the top berries to keep them submerged.

Place lids on jars and store undisturbed in a cool dark place for about one month.

Strain berries from vinegar without pressing on them and discard berries.

Store vinegar in a cool dry place.