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A former boss from over there told me that or some it's treated as a rite of passage. Parties are organised where a little bit of the rancid shark thing is put in a sandwich loaded with things to hide the taste (which to me would seem to undermine the whole idea of a rite of passage, but hey). He said he ate a baguette larded with onions, mustard and so on, and there was this small slimy bit in the middle that he just tried to ignore.
Only tourists eat the shark thing