8den
No I'm pretty sure that was 8ball...
I'd put the gherkin inside. Then eat it.
I can see the logic (kinda), some people don't like gerkins so lets put it ontop of the burger). But my wife wouldn't eat the bun if it was soiled with a gerkin (in fact when making burgers I need to slice my gerkin at the last moment as she hates the idea of any of her food touching a gerkin, or sharing a chopping board with a gerkin.
The gerkin on top is a gimmick. I dislike it.