acorn meal bread
When looking on the Net for Acron Flour (for a friend), I found the following:
"Acorn mush was eaten by Native Americans almost everywhere in California. Prepared acorns have a lovely nutty flavor, and fixing them as described here is a bit of an adventure. For those interested in the dish but not wishing to devote a day to its preparation, acorn flour can be bought in most Korean grocery stores."
Hope this is the information you were seeking.