Yeah, you use it with the bacteria concentrate to make the carrier for the bacteria. So far we have just purchased the premade bran/sawdust bookashi, but the next batches will be home brewed.
I figured it would come up: it's easier to crush the skulls of your enemies if you roast them for hours first at like 450 degrees. Make sure those teeth are a fine powder!
Very good. It shall be done.
Be sure and post about the brewing of the bacteria :)
Oh, can and will do.