I use a blade-type coffee grinder to grind salt with homegrown dried herbs and peppers. This leaves some dust in the grinder, and I'm afraid to wash it with water. I used to wipe that out with a paper towel, but I switched to using plain white rice, grinding it to scour out whatever had been ground before.
I always used to toss the ground rice, but yesterday I wondered, couldn't it be used? So after I ground some ghost peppers, I ground two batches of rice, and let it spin longer so the texture was like a coarse rice flour. Then I cooked it with water and butter, in the style of a hot cereal.
The texture came out very similar to grits, or Cream of Wheat if you're familiar with that product. Some people hate anything with that texture, but I always liked it. As a plus, the rice was nicely contaminated with traces of ghost pepper powder.
And the grinder is clean and waiting for the next round.