clean & pat dry your chive blossoms. make sure all the water is off so it doesn't dilute your vinegar.
fill your mason jar at least half full with the blossoms. add your red pepper flakes now too.
start with adding 2 cups of vinegar to your mason jar. you will want enough vinegar in there to fully submerge the blossoms. push the blossoms around & crush a few to release more flavor.
cover the mason jar with a piece of parchment paper & a rubber band.
set in your cabinet for 2 weeks & let your vinegar steep!
after steeping, you can strain the vinegar & discard the blossoms.