British delicacy or punk rock band name?

I pretty much hate going to the grocery store, so I avoid it at all costs. Being on my own for the next couple of weeks, however, meant I really had to go as soon as I got back this afternoon. Well, turns out this is evidently the sort of thing I've been missing by not going to the store more often--whatever this is, it stopped me dead in my tracks when I walked past it while navigating the aisles: