There are several locally-produced hamburgers like "Karatsu burger"（唐津バーガー）,"Sasebo burger"（佐世保バーガー）. Today, I ate "Genkai burger" （玄海バーガー） when I took a short rest in bike ride.
I have known the food for several years, but I have never had a chance to try it.
It is a sandwich consisting of a fried fish, instead of a cooked patty. And the shop's owner says all fishes used for the burgers are taken in this local area.