The answers tends to be either finding a way to eat the inedible (because there are times where calories > no calories regardless of the source of calories), or finding a way to conserve it somewhat / somehow. Even ignoring its use in creating alcohol from sugars, fermentation can do both (separately or at the same time) and more.
Often these become typical delicacies (the flavors can be intriguing or interesting, or "interesting" in the case of some like Hákarl and possibly the Hongeo-hoe you're talking about).
For Casu marzu, it's probably either finding a way to control spoliation such that the result is still edible, though it's also possible that uncontrolled spoliation simply resulted in something those adventurous (or desperate) enough to try eating it took a liking to.
I'd expect the latter to be the story here: hard cheeses like Pecorino keep a while until they're "open" and you start eating them, and it's not a huge cheese (I believe pecorino wheels are under 2kg, we're not talking the 30+ wheels of a parmesan or comte).
Or maybe sardinia regularly has conditions where the cheese can't be kept and so a controlled decomposition was superior to just losing the cheese.
I have a friend who was in a forced-labor camp and this pretty much sums it up. I recall him describing that the "meat" they were given was usually so rotten than the only way they could stomach it was to basically cover it in chili peppers to mask the taste and smell. But it kept them alive.
These weird foods probably have concentrations of various things that you simply won't see in anywhere else. Salt appetite is a proven and understood phenomenon but i bet there's similar things going on in all of these foods. You try it once and probably don't like it then and there and then one day your brain brings up the memory of that food and tells you to go eat it again.
That's how "acquired tastes" develop physiologically and culture takes care of passing it down the generations.
A basic cheese doesn't involve any fungus...?
Maybe it helps that I never licked a urinal, so I have no idea what a urinal tastes like.
Monggae bibimbap had a lot of ammonia, but there were some pleasing elements. I can't remember if I've tried hongeo hoe, but I can imagine it could have some appeal.
Of course, all of these things are insane to the average Midwestern US person that I might encounter.
To me it’s like a strong creamy cheese. But I could see how some people find it unappetizing.
I can’t stand jackfruit any more. I used to love it, but now it just smells like the fake lemon smell of soap.
https://www.britannica.com/story/why-does-cilantro-taste-lik...
Thanks for teaching me something new.
But many people don't like it indeed, so I must accept this as a fact.
Most of the food we eat have come to be through centuries of iterations to make it better tasting, safer, easier to preserve, etc. or simply edible.
For example olives taste really bad in nature, to make them tasty there are different ways, including immerse them in a solution of water and caustic soda or water and burnt lime, which are highly toxic substances.
I can't even wrap my head around how someone thought it was a good idea, but however the procedure was invented, it worked and we can now experience the amazing taste of sweet olives.
Or think about meat hanging (dry aging) where meat is aged for weeks before being eaten.
Greenland has its own fermented cartilaginous fish, Hakarl. At least twice in culinary history, someone decided that letting a shark or skate sit somewhere long enough to get WEIRD and start reeking of piss so badly that it hurts wasn't such a bad idea and eating it might be okay. Crazy.
There’s definitely a story of desperate starvation in there somewhere.