Suribachi and surikogi
Suribachi (すり鉢 or 擂鉢, literally: grinding-bowl) and surikogi (すりこぎ or 擂粉木, literally: grind-powder-wood) are a Japanese mortar and pestle. These mortars are used in Japanese cooking to crush different ingredients such as sesame seeds.
The suribachi is a pottery bowl, glazed on the outside and with a rough pattern called kushi-no-me on the unglazed inside. This surface is somewhat similar to the surface of the oroshigane (grater). The surikogi pestle is made from wood to avoid excessive wear on the suribachi. Traditionally, the wood from the sanshō tree (Japanese prickly ash) was used, which adds a slight flavor to the food, although nowadays other woods are more common. The bowls have a diameter from 10 cm to 30 cm. To use the suribachi the bowl is set on a non-slip surface, such as a rubber mat or a damp towel, and the surikogi is used to grind the material. Recently, plastic versions of the suribachi have also become popular, but they have a much shorter lifespan.
The suribachi and surikogi arrived in Japan from China around 1000 AD. The mortar was first used for medicine, and only later for food products.