Typically when I travel, I get as many meals as practical (and polite to my hosts who want to feed me) from street vendors. My general theory is that if other mammals, specifically humans, are eating it, it's probably ok.

Seoul Korea in 1991 was no exception. As usual, everything was pretty good, or at least palatable. At one point however, I joined a group of laborers in line for some sort of deep-fried dumpling. It was a brown ball, with a greenish paste inside. I basically looked like a Korean falafel. However, it tasted like a dog had eaten a dead squirrel and pooped it out into the deep fryer. I later learned it was some sort of fermented worm paste considered comfort food to laborers from remote rural areas.