Great picnic, walk, and birding at Indian Grinding Rock State Park, California, Sierra Nevada Foothills.
This is a Valley Oak, our largest.
The Native Americans gathered the massive amount of acorns from these trees and ground them into flour on rocks with holes made by all the grinding.
The flour was used for bread and mush, seasoned with herbs and salt. I don’t know how it tastes but is very nutritious.
They would cook the bread wrapped in poison oak leaves.
This was a social community effort.
Just think: free food there for the grinding.