Wash freshly cut chive flowers in cold water and dry them thoroughly.
Fill a clean and dry sterilised jar with the chive flowers, until it's around two-thirds full.
Next, fill the jar with white wine vinegar.
Seal the jar, and store it in a cool, dark place for around two weeks.
After two weeks or so, using a sieve, strain the liquid into a sterilised bottle. Pop the lid on and this will store in a cool dark cupboard for around a year. The pickled flowers can be composted.