The stevia that I hung to dry a while ago has finally finished drying, so it was time to grind it for storage and use. It's a very sweet tasting herb that can be used in place of sugar (click either of the links to learn more).
My molcajete (a traditional Mexican mortar and pestle cut from lava rock) made quick work of turning the dried leaves into a fine powder. The porous texture of the stone makes it really easy to pulverize herbs and spices. The air was deliciously sweet-tasting while I was doing the grinding!