A shamoji is a flat rice

Rice

Rice is the seed of the monocot plants Oryza sativa or Oryza glaberrima . As a cereal grain, it is the most important staple food for a large part of the world's human population, especially in East Asia, Southeast Asia, South Asia, the Middle East, and the West Indies...

 paddle used in Japanese cuisine. It is used to stir and to serve rice, and to mix vinegar

Vinegar

Vinegar is a liquid substance consisting mainly of acetic acid and water, the acetic acid being produced through the fermentation of ethanol by acetic acid bacteria. Commercial vinegar is produced either by fast or slow fermentation processes. Slow methods generally are used with traditional...

 into the rice for sushi

Sushi

is a Japanese food consisting of cooked vinegared rice combined with other ingredients . Neta and forms of sushi presentation vary, but the ingredient which all sushi have in common is shari...

.

Shamoji are traditionally made from bamboo, wood, or lacquer

Lacquer

In a general sense, lacquer is a somewhat imprecise term for a clear or coloured varnish that dries by solvent evaporation and often a curing process as well that produces a hard, durable finish, in any sheen level from ultra matte to high gloss and that can be further polished as required...

, and nowadays often from plastic. The shamoji is dipped in water frequently during use to prevent rice from sticking to it. Some expensive plastic shamoji have non-stick surfaces. Metal is rarely used, as this is more likely to cut rice grains or to damage the hangiri

Hangiri

In Japanese cuisine, a hangiri , also known as handai is a round, flat-bottom wooden tub or barrel used in the final steps of preparing rice for sushi. Traditional hangiri are made from cypress wood bound with two copper bands...

 wooden tub traditionally used for mixing.

It is said to have been first devised by a monk on Itsukushima

Itsukushima

is an island in the western part of the Inland Sea of Japan, located in the northwest of Hiroshima Bay. It is popularly known as , the Shrine Island. The island is one of . Itsukushima is part of the city of Hatsukaichi in Hiroshima Prefecture...

, Hiroshima Prefecture.

Modern rice cookers may include a shamoji in the box, usually made of white plastic.

Shamoji are also used to crush vegetables, such as garlic

Garlic

Allium sativum, commonly known as garlic, is a species in the onion genus, Allium. Its close relatives include the onion, shallot, leek, chive, and rakkyo. Dating back over 6,000 years, garlic is native to central Asia, and has long been a staple in the Mediterranean region, as well as a frequent...

 and cucumbers, as cleavers

Cleaver (knife)

A cleaver is a large knife that varies in its shape but usually resembles a rectangular-bladed hatchet. It is used mostly for hacking through bones as a kitchen knife or butcher knife, and can also be used for crushing via its broad side, typically garlic....

are used in Western cuisine.

The shamoji has also been a symbol of unity between the mother and wife in Japanese society. In traditional times, it passed down from one generation to the next to symbolize the handing down of family duties.