Chirmolera

A chirmolera or molcajete made of clay is a Mexican cooking tool. The interior surface has a series of grooves cut in the clay, similar to the interior of a Japanese suribachi. The grooves create a rough surface for grinding. The pestle used is also made of clay. The image shown is a pig head molcajete but chirmolera are also frequently just round bowls.

Japanese suribachi OR other mortar and pestle