Originally Posted by satph
I believe the onions are there for aroma, gets people hungry so they buy from him. Carnival food vendors do that with onions on the griddle even if they don't put them on any menu items.
That is the first thing that crossed my mind when I walked by, but he claims he doesn't use wood chips. Unless I mistook him.
There didn't seem to be enough onions in that bucket to make much smoke, though.
Still, I would be worth playing around with. Grilled onion do smell good!