Uramaki (裏巻, "inside-out roll") is a medium-sized cylindrical piece with two or more fillings, and was innovated as a result of the creation of the California roll, as a method originally meant to hide the nori. Uramaki differs from other makimono because the rice is on the outside and the nori inside. The filling is in the center surrounded by nori, then a layer of rice, and optionally an outer coating of some other ingredients such as roe or toasted …

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Uramaki (裏巻, "inside-out roll") is a medium-sized cylindrical piece with two or more fillings, and was innovated as a result of the creation of the California roll, as a method originally meant to hide the nori. Uramaki differs from other makimono because the rice is on the outside and the nori inside. The filling is in the center surrounded by nori, then a layer of rice, and optionally an outer coating of some other ingredients such as roe or toasted sesame seeds. It can be made with different fillings, such as tuna, crab meat, avocado, mayonnaise, cucumber or carrots.

Examples of variations include the rainbow roll (an inside-out topped with thinly sliced maguro, hamachi, ebi, sake and avocado) and the caterpillar roll (an inside-out topped with thinly sliced avocado). Also commonly found is the "rock and roll" (an inside-out roll with barbecued freshwater eel and avocado with toasted sesame seeds on the outside).

In Japan, uramaki is an uncommon type of makimono; because sushi is traditionally eaten by hand in Japan, the outer layer of rice can be quite difficult to handle with fingers.

http://en.wikipedia.org/wiki/Sushi#Uramaki

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