If you grow your own chives you can cut the blossoms and make chives blossom vinegar. It turns a gorgeous pink color and the longer you leave the blossoms in the vinegar the strongest the chives flavor will be. Once it is at the strength you like you remove the blossoms and then use the vinegar in any way you wish.
It is a wonder vinegar to use in salad dressings. See how to make your own chives vinegar with the instructions from , Earth Food and Fire.