Allium Chinense
荞头/蕎頭 (Mand: qiáo tóu; Cant: kiu4 tau4) are also known in English as Chinese bulbous onions, Chinese onion,[Chinese scallion, glittering chive, Japanese scallion, Jiangxi scallion, and Oriental onion.
They are mildly flavoured.
The bulbs are also often pickled and served at the start of banquets and wedding feasts to keep you going until all the guests arrive. I use the pickled onions a lot in a non-Chinese way - with cheese and in sandwiches. Good with chicken liver pâté, too. I have no respect.