Half fill the glass jar with freshly picked violet flowers, approximately ½ - ¾ cup.
Seal the jar with a non-reactive lid and place the jar in a cool, dark place for 1-2 weeks. After this time the flowers will have leached their colour into the vinegar, and the vinegar will have a violet aroma.
Drain the liquid from the flowers, discard the flowers and pour the violet vinegar into a bottle.
Seal, date and store in a cool, dark place.