But which soup goes best with that distinctly fish-forward, creamy tuna fish sandwich? As it happens, it's a soup that pairs well with another classic sandwich: the grilled cheese. That's right ...

This version forgoes the classic canned cream of mushroom soup base and instead leans on tonnato sauce, a bright and briny Italian condiment made with pureed canned tuna, anchovies, and mayonnaise ...

Noodles served with tuna, yellowtail ... soup based on stock made with kelp and bonito flakes. "Raw fish goes well with our soup and is popular," the restaurant manager said.