Obviously not in a pedantic sense, just that they also don't look appetizing on their own, it's the flavor that's associated with them that makes it work.

If we're being honest a hamburger looks like a smashed turd and a hot dog looks like fluorescent factory meat.

Now that I think about it a regional American dish that comes to mind is the garbage plate (named aptly for being a hodgepodge of leftovers) which looks like someone unloaded on a tray of french fries part way through their colonoscopy prep and then blew their nose on top of that:

Flavor is suprisingly solid.

Another would be oatmeal which can taste quite hearty if done right but looks very much like snot in a bowl: