This is a simplified version of a classic pressed-sushi from Japan's Nara region, which has no direct access to the sea. The people of Nara were able to satisfy their taste for fish and even pack it as a traveling lunch, by using cured fish and persimmon leaves, which have antibacterial properties. The leaves (usually salted while they are still green) are not consumed. In this version, the colorful leaves are mainly for creating an autumnal presentation.