Expanding the pit mechanic to food processing

[allstreets]

I think it would be an interesting and useful addition to the stone age to have pits for food processing - specifically of cassava, which currently requires barrels, and acorns. This could be as simple as creating a charcoal pit structure that cassava/acorns could be stacked in, adding water (carried in a cooking pot or bowl), and sealing for several days. Or something more simplistic, like just blocking off a water block and placing items in there. This would allow limited cassava consumption pre-copper age, and enable processing of acorns into flour or as a grain-like ingredient for acorn mash (both very popular foods of indigenous people where I live).