Pickled vegetables make a tasty addition to sandwiches and salads.
In a medium saucepan, combine all the ingredients with 1 cup water. Bring to a boil; reduce to a simmer, and cook until onion is crisp-tender, 3 to 4 minutes. Transfer to a bowl, and refrigerate until cold, about 3 hours; serve with a slotted spoon. Store in an airtight container in the refrigerator for up to 3 days.