Here’s a useful piece of information for the “pub trivia” section of your brain: Burger King introduced its onion rings in 1974. We came across this ad for them in TV Guide, mostly noticeable for the terrible ad copy, the modest serving size, and the fact that the onion rings are not actually on a burger. It’s like fast food from a different world.
Maybe there’s a generation gap, but whoever wrote this ad was very fond of the phrase “French Fryin’ Legion,” which isn’t particularly clever and has no clear connection to onion rings. Maybe if an anthropomorphic onion were wearing a white cap.