How to Use a Mortar and Pestle: 12 Steps (with Pictures ...
Sep 05, 2019· Grind some dry rice for about 15 minutes, then for 5 minutes with a little olive oil added to form a stiff paste. That will really polish up the inside, so removing the fine stone dust. Wash out with warm water and allow to air dry. Do not use any detergent at all, as this taints both the mortar and pestle.