Thanks Alicia
The cold water leaching worked very well, made some tasty pancakes and cookies with the dehydrated flower.
according to a Portuguese girl I met there are oaks that have the same leaves as cork oak, but have no cork bark,and they have sweet acorns!
I found some of those oaks, but they are rare. So I am experimenting with ways to collect and process the bitter acorns as efficiently as possible, for own use and as chicken feed...