Prepare enough sterilized bottles or jars to hold 1 litre of liquid.
Clean the fresh tarragon carefully and divide it between the bottles or jars. Fill with vinegar, cover tightly, and store in a cool, dry, and dark place.
After a few months of infusion, you will have a beautifully aromatic tarragon vinegar, perfect for everyday cooking — especially during winter, when fresh tarragon is much harder to find.