Dutch people eat like an alleycat in a cartoon

https://lemdro.id/post/30170859

It tastes fantastic, though. If you happen to like fish.
Is it a raw fish with onions and pickled cucumber?
It’s pickled herring. The Dutch put them in wooden casks where they ripen, so they become incredibly tender, very mild and just a little salty. And they don’t smell bad at all. I’m German and whenever I visit the Netherlands, I make sure to have some.

Here in the US I’ve gotten a lot of pickled herring over the years, and “mild” is NOT how I’d describe it. It’s super sour and sweet (and creamy if you get ones with sour cream, which I usually do) One of my favorite foods, but now I’m worried that I’ve been eating something else lol.

incidentally had some in my fridge for reference

That's something completely different. If it's super sour it's probably something like a rolmops. Also referred to as sour herring. It's very different from the fresh raw, slightly pickled herring.