alt Hacker Newsgood option.
i like that too.
metal ones are also available in india, made of stainless steel and maybe other metals instead.
traditionally, people in india used a thick flat wide stone and a thick cylindrical stone grinder applied back and forth on top of the lower stone, to grind spices, onion, ginger, chilllies, turmeric, etc., into a paste or masala, which was then used in making curries, sambar, and other dishes.
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here is an image of one such stone pair, not exactly what we had at home, but close:
https://www.natureloc.com/products/ammikallu-grinding-stone
also called aattukallu in tamil and iman dasta (iirc) in hindi or urdu, but searching for the latter only gave results for mortars and pestles, which are not the same thing as the one above, the ammikallu.
Traditionally grinding things with stone ended up with people eating stone which ground their teeth down[1]:
> "A. When soft stone like sandstone was used for milling grain, as the ancient Egyptians often did, residue from millstones could cause a serious problem over a lifetime, said Dr. Robert K. Ritner, associate professor of Egyptology at the Oriental Institute of the University of Chicago. Egyptian teeth have been well studied in mummies, and only the rare mummy had good teeth, said Dr. Ritner, who lectures on Egyptian medicine. ''They usually had heavy abrasion, and were sometimes so worn down at the crown that the pulp or even the root was exposed, which must have been horribly painful,'' he said. The Egyptians were obsessive about cleanliness, using a natural soda compound called natron for cleaning the mouth and sometimes a chewing reed to massage the teeth. They had few cavities, and the damage seen in studies pioneered by the English researcher F. Filce Leek almost certainly resulted from the residue of disintegrating millstones."
[1] https://www.nytimes.com/2002/08/06/science/q-a-teeth-and-mil...
[2] https://boards.straightdope.com/t/do-whole-grains-damage-you...