Some onion or other

Well, I know it's an allium. But beyond that I don't know what it is: onion, or whatever.

It came up unbidden in my community garden plot, a gift from last year's user of that plot.

I've pulled others like it and they appear to be shallots. However that may be just the stunted growth of the bulb as a result of having gone into proper flowering and seeding mode.