Surströmming is an interesting case. Most of the country does not eat it, and it’s not the kind of thing you usually go pick up in a restaurant - eating Surströmming is an occasion, one that warrants a special feast that you arrange at home and invite friends and family to.
Most of the videos online (intentionally) eat it wrong. Don’t open cans indoors, don’t drink the liquid and don’t eat the fish themselves without anything accompanying them.
To eat surströmming properly, you want to first open the fish and clean out the bones, then make them one component in a flatbread sandwich (hard flatbread is traditional) along with butter, potatoes, chopped red onions, sour cream, and chives. They should then be accompanied by large quantities of snaps, hard liquor consumed as shots.
Surströmming is kind of like fish sauce - the production method is similar, they both smell kind of wild, and taste very different from what they smell. I also think they serve similar culinary functions - surströmming is in my opinion best thought of as a condiment adding interesting flavours to the dish they are used in.
The smell is ghastly though. I was not a fan of the Surströmming parties my parents hosted as a kid, and tried my best to stay clear those days.