In other words, this is a rock made for the kitchen. Embrace your instinctive caveman nature and just bash and grind the living hell out of your food. It might not be as rugged as just grabbing a big rock from the wild, but it’s surely more manly than using a porcelain mortar and pestle.
For $43 you could do worse than buying a tool of our evolutionary past. No instruction manual is needed. Your animalistic instincts will put two and two together. Rock = smash.