Uramaki, California roll, or upside-down sushi is a unique sushi variety which has its origins disputed between Los Angeles and Vancouver, although most people claim that it was invented in California in the 1960s by a Japanese chef named Ichiro Mashita.
This sushi roll is prepared with sushi rice, nori, fish (mostly tuna or salmon), avocado, and cucumber. It differs from other sushi types because the rice is on the exterior, wrapped around nori seaweed that is in the inner part and surrounds the filling.