Ask the Alchemist #314 — Chocolate Alchemy
WEBMar 30, 2023 · This is why a good burr espresso grinder can get coffee super fine and that is the basis of something called a ball mill. Lots of balls trapping material between it and crushing it. More on that in a moment. I quickly learned coffee grinders clog up. The oil in the chocolate gums up the fine grooves in the burrs and you are done.