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Naturally flavored vinegars are both popular and healthy. I found this recipe for homemade chive vinegar on the Cats on the Homestead website.
There are very specific directions about when to pick the chive blossoms and how to rinse and dry them. Then there are instructions on how to prepare the chive blossom and vinegar infusion. In general, it takes 4 to 6 weeks for the vinegar to be ready to use.
Very well-written article and the photographs are beautiful.