If you have an unseasoned mortar and pestle or one made out of granite stone then you need to season it before using.
Care for granite mortar and pestle.
Place the mortar on a stable work surface that will not crack under the pressure from pounding the mortar.
To clean stone mortar and pestles made from marble granite or lava stone use warm water and rice.
Clean ceramic glass and metal alloy brass iron mortar and.
Read any instructions that were included with your mortar and pestle and follow any tips for cleaning and care.
How you clean your mortar and pestle depends on the material it is made of.
This is because the porous surface can release particles of stone and grit into your food upon first use.
Grind a handful of uncooked rice in the mortar and pestle by moving the pestle in rotating pressured motions alternated with up and down pounding.