This is on the lunch menu at 2it & Drink, but I don't think it's on the main menu. Apparently this is a tradtional configuration of tuna and onions though, and it worked for me, especially since the tuna didn't remind me of childhood sandwiches.
The atmosphere was really casual. Reminded me of iO Italian Osteria because of both their naming styles and the setup.
Overall, 2it & drink is definitely a place I would recommend you try at least once.
Portions were not overly huge, and could be consumed in a few mouthfuls if you take big bites.