Tazuna-Zushi and Oshi-Zushi — Pressed Sushi Forms
Osaka, Japan — Kansai region pressed sushi tradition predating Edomae nigiri
Before Edomae nigiri became Japan's dominant sushi form, pressed sushi (oshi-zushi and hako-zushi) represented the country's primary sushi tradition. Oshi-zushi is assembled in wooden box moulds (oshibako): rice pressed under a lid into a compact block with toppings (mackerel/saba, salmon, sea bream, or vegetables) and cut into rectangles. The Osaka/Kansai region never fully converted to nigiri — Osaka's battera (mackerel oshi-zushi covered in thin kombu sheet) remains the most important regional sushi form. Tazuna-zushi (braid sushi) is a Kansai technique where alternating strips of coloured ingredients (thin-sliced fish, egg, cucumber) are arranged in a diagonal braid pattern on sushi rice spread on plastic wrap, then rolled into a cylinder and pressed — when sliced, it shows a kaleidoscope cross-section.