Natto (Japanese)
Vegemite (Australian)
This is coming from someone who happily ate everything else served to me in rural Japan without a moment's thought. I love raw squid, ate a plate of duck tongues, etc. I had to go a very long way to find foods I couldn't get down. Trust me. If you aren't raised on natto or Vegemite...you will not like them. It can't be done.
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Ceramic water pipe