There are a lot of books about Native Americans and when I wanted to learn about eating acorns, I thought sure that I could go to the library and find a book that would tell me how to do it. That was not the case. I went through countless books and the only thing I could tell was that they were using water to leach them. I did not know how long the Indians leached them, nor did I know if they kept them cool in the process. I was just a girl who loved nature and wanted to live and sustain myself within the woodlands of Northern California.
So I gathered acorns. By the pillowcase full. I totted them up the hill to my house and with a large river rock, cracked them open. Then, I put the shelled acorns in a white plastic bucket and covered them with water. I had to guess how long to leach them. They don’t leach well if they aren’t ground up and without refrigeration, they get a scum on them. I lived without electricity so I couldn’t keep them cool. I just poured the scum off and rinsed them really well. I ensued a lot of stomach aces though. Not from the scum but from the tannic acid not removed well enough.
With a lot of trial and error, I finally figured out how to leach acorns. The answer is; long enough to get the tannic acid out. Each oak species has different tannic acid amounts. You have to experiment yourself. My guess is that you will need to leach them anywhere from one week to a month. The tan oak acorns I used in Mendocino County, California required only one week’s leaching. But the acorns I gather in the Sierra Foothills require three times as much leaching.
Don’t be discouraged. They’re worth the wait. Acorn dip with blue corn chips… the thought of it makes my mouth water. That’s probably the little bit of tannic acid that is retained that gives the acorns and any dishes you make with them, their distinctive flavor.
Suellen Ocean is the author of Acorns and Eat’em, a how-to vegetarian cookbook and field guide for eating acorns, http://www.amazon.com/Acorns-Eatem-How–Vegetarian-Cookbook/dp/1491288973 and Secret Genealogy IV – Native Americans Hidden in Our Family Trees. http://www.amazon.com/Secret-Genealogy-IV-Native-Americans/dp/1500756105