I did taste this once. It was fun to try, but only to tell the story. Not a fan :p
Read more and watch a video of Hákarl in the making.
You can also read more about the process here.
Katie Serena “Hakarl — Iceland’s National Dish Is Basically Rancid And Toxic Shark” https://allthatsinteresting.com/hakarl published 26. february 2018, last accessed 6. february 2021
Skåra et al. (2015) “Fermented and ripened fish products in the northern European countries” https://doi.org/10.1016/j.jef.2015.02.004