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Good question. I've found that the coffee grinder will work, but you have to break it into small pieces first and only do a little bit at a time. If it's a really tough one, you may have to break out the hammer. But a coffee grinder *should* work. If it's still too tough to do, you may have to just let it stew in some hot water for awhile, then transfer it to a cuisinart-type of thing [something that can handle wet material] after it's softened significantly.