Southeastern Papua New Guinea
The Korowai tribe are among the last people on earth to for-real eat people on the regular. The further up the Ndeiram Kabur River you go, the less contact with foreigners these tribes have had, and the more likely they are to eat you.
What they ate: The still-warm brains of witch doctors were considered a real treat.
Why they ate it: When someone in the tribe died, it was obviously not because of natural causes or disease, it was due to black magic. Ergo, an evil spirit must've been lurking in a fellow tribe member, who should consequently be identified, killed, and eaten to protect everyone else.
Famous food?: In 1961, Michael Rockefeller, son of then-New York governor Nelson Rockefeller, vanished while collecting artifacts from another Papuan tribe; his body was never found.