Baked bean and cheese toastie, you know, the type you make in a breville. Mind you i continue to forget to let the toastie cool down and burn myself which strangely at the one doesn't hurt!
When I lived next to the 7 Dials in Brighton it was a Doner kebab every time.
I lived at the top of Eastern Road for a few years not far from the petrol station, sometimes on the way back from town I would buy a white magnum in the garage.