Sushi is a typical Japanese food with over a thousand years of history and tradition. It has become perhaps the most visible example of Japanese cuisine in other countries.
Consists of cold cooked rice dressed with vinegar that is shaped into bite-sized pieces and topped with raw or cooked fish, or formed into a roll with fish, egg, or vegetables and wrapped in seaweed or stuffed in a small tofu pouch. The common ingredient in all the different kinds of sushi is sushi rice. Variety arises in the choice of the fillings and toppings, in the choice of the other condiments, and in the manner it is put together. The same ingredients may be assembled in entirely different ways to different effect. The following are some of the more common ingredients.
As many ingredients that are used, there is also just as many ways to prepare and assemble those ingredients. This page goes through the ways of preparing sushi. However when it comes to ordering these types, it is simply not as simple as saying what "type" of sushi you want, as each type has it's variations and possble ingredients. So if you want Nigiri, you will need to tell your sushi chef (Itamae-san) what you want it made of such as tuna, salmon, yellow tail, etc. Same thing applies to ordering other types of sushi as well.