The chunks in the picture are purpose-made in the hotel pan in the fire pit, but the left over black bits in the fire pit are the same thing.Thank you. So it's basically the leftover "chunks" in the fire pit, it seems like (although yours is much prettier than mine, haha!). Do you grind it up into smaller pieces?
I do crush the biochar somewhat to increase surface area and make it mix in with the shavings better. My low-tech solution? I put it in an old 5-gallon bucket and grind it with a scrap of 2x4.