Finland: only had it a couple of times 'cause it's expensive, and takes long and is tedious to make, but loimulohi (fire salmon). It's salmon nailed to a plank and then heated up by an open fire. Very tasty.
Pretty much any big enough fish can be made like that, but I've only had salmon.
Which appid? 'cause one of the unknown appid's Valve was working on is a Deadlock private testing server (yes, the game in invite-only alpha has a private alpha that is even more restricted.)