Battera and Hako-zushi: Osaka's Pressed Sushi Tradition

Osaka's regional sushi tradition, hako-zushi (box sushi), predates the hand-formed Edomae style now associated with Tokyo. Fish and rice are layered into a wooden mold and pressed into neat rectangular blocks, then sliced into portions — a very different process from a chef shaping each piece by hand. Battera, a specific and well-known example, uses vinegar-cured mackerel pressed over rice with a thin sheet of kombu on top.

Because the fish is cured rather than raw, pressed sushi historically kept longer than nigiri, which made it practical for travel and takeout before refrigeration — a reminder that curing techniques were originally about preservation, not just flavor. It's denser and more compact than nigiri, often eaten as a snack or packed into a bento, and it's less common on menus today, though specialty sushi shops still make it.