Oshi-Zushi 押し寿司
oshi/osu - press/pressed Pressed (oshi/osu) Sushi. Using a special wooden box which can be taken apart into three parts, put the sushi-rice and topping into the box and press. As far as I know it was born and popular in western regions of Japan, like Osaka and Kyoto. The well known oshizushi is battera with soused herrings.