Trying to eat acorn of クヌギ

Trying to eat acorn of クヌギ with interesting to Japanese ancient people 縄文人. My strategy to remove tannin from it is just to immerse it into water, keep in refrigerator and wait for maybe a half year. Maybe I can eat. きっと食えるだろうその日を楽しみに。

3日ほどでここまでタンニンが抜け、焦げ茶色から薄茶色へ。