In Germany, eating Mettbrötchen is rather popular in certain regions, and somewhat popular in the rest. As far as I know, that also applies to some neighboring nations.
A Mettbrötchen is basically minced raw pork with some salt, pepper and other spices, with onions on top or worked inside the meat. You put that on a baked roll (or sometimes other bread). There is also Mettwurst (sausage), although that's often at least smoked. Rarely the mett you'd eat raw is a mix of raw pork and raw beef. Mett may only be sold on the same day it was prepared, but it's rather popular so you will find it in basically every supermarket (especially the ones with in-house butchers), or you can buy ready to eat Mettbrötchen/Mettbrote (rolls/bread) in basically every full service bakery and some self-service ones.
I am not really fond of that to the point I would prepare that for myself, but have occasionally indulged when offered.
Bonus picture: Mettigel (mett hedgehog), which is for various popculture reasons a popular way to decorate the mett (before you put some of it on a roll/bread)
https://upload.wikimedia.org/wikipedia/commons/0/0a/Mettigel...