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I had lots of responses, but mostly from people who are also looking for a
place to find it!
There were suggestions of trying Korean stores as this is a traditional
thing. There were a couple of warnings about Chinese sourced flours. And
several people offered to share their methods of making it from scratch.
Sadly, oak trees are uncommon where I live.
Thank you to every one who responded.
Sincerely,
Rebecca
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