"Fresh chive blossoms steeped in Champagne vinegar makes a subtly chive-flavored, blush-colored vinegar. Try it in your next vinaigrette salad dressing, and make several batches of this gorgeous vinegar to give away all summer. After 2 weeks, the vinegar will take on the delicate purple color and subtle onion flavor of the chives."
Wash chive blossoms by holding them upside down from the stem and plunging them into a deep bowl of cold water. Swish them around to dislodge any soil. Pour out the water and repeat 2 or 3 times.
Snip or pinch off each blossom where it meets the stem. Dry blossoms gently but thoroughly with paper towels or in a salad spinner. Pack canning jar with blossoms loosely.
Heat vinegar in a small saucepan over medium-low heat until hot but not boiling, 2 to 4 minutes. Pour hot vinegar over blossoms in canning jar, screw on lid, and store in the refrigerator until desired flavor intensity is reached, 1 to 2 weeks. Strain out blossoms and store vinegar in a sterilized glass container.