I was recently in Jakarta and got taken for lunch to some fancy sandwich place in an exotic gigantic shopping mall. I had a sandwich on really good dark bread, made of very smoky smoked marlin, arugula, thin sliced sweet onion and horseradish and it was great. I'd like to recreate it now that I'm home. I know a lot of places for smoked fish here in town, but I can't recall seeing smoked marlin anywhere. Any ideas?