Acorns were a staple of most of California’s indians. The UC history guide on traditional uses for plants in california stated that a family would gather around 500lbs of acorns per year. White oaks were preferred, having less tannins, but all of the oaks could be used. The tannins would be leached out, the acorns ground. The meal would be boiled or shaped into bricks and baked as “bread”.