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The aboriginal people of the Columbia river valley used urine to cure acorns. The settlers of European origin in that region gave the dish the name Chinook Olives.
About 35 L of acorns were placed in a hole near the entrance of a house. The acorns were then covered with a thin layer of grass and then dirt. Urine from every family member was collected and deposited in the hole for the next 5 – 6 months.
The dish was considered a delicacy.
References
Chinook olives Wikipedia(Text) CC BY-SA