I love all kinds of infused oils and vinegars. The chives have overtaken my herb garden and this is one good way to eliminate so much infestation. I am also now cutting those pretty blooms for the table.
Cut chive blossoms just below the flower. Rinse in cold water...submerging. Drain in a colander to remove water
Heat vinegar on the stove only until warm...do not allow it to come to boil.
Place blossoms in a sterilized pint jar. Pour warm vinegar over the top of the blossoms. Place a plastic lid on the top or parchment paper between the vinegar and the lid....no metal and vinegar contact.
Put in a dark place for 2-3 weeks. Check to see how Onion'y you want your vinegar. Drain off the blossoms and jar your vinegar in a dispenser jar.