Jamun Sirka or Jamun Vinegar is made by fermenting fresh jamun fruit pulp or juice. The fermentation process converts natural sugars into alcohol, which then turns into acetic acid — giving it that characteristic vinegar taste. Many brands such as Swadeshi Jamun Vinegar and Jamun Plus Vinegar offer this in bottles of 500 ml or more, and you can easily buy Jamun Cider Vinegar online. https://swadeshiayurved.com/products/jamun-vinegar-juice