I have made lots of acorn flour this year.
I collected about 10000 acorns and shelled them then rubbed off the skin, then grated them, (beleive it or not this is not the tedious bit)
The tedious bit is then the leaching, put the gratings into a big bowl and fill with cold water. Leave for several hours then pour (gently) off the brownish water (with a bit of a petrol like scum on top) (try not to take pur out too much of any whitish (flour/starch) stuff at the end.
Then repeat.
Then repeat. etc
(until the taste of the gratings is not bitter)
I then took the gratings, squeezed them out (keeping the squeezed water)
then put them on tray to dry. with the white starchy water remaining (and squeezed water) wait for this to settle, then try to pour off as much of the clear water without loosing the white (I use this white starch for ultra fine flour)
I dry the gratings and fine flour in the oven (not hot, try to use the remnants of heat of oven after cooking, for ecologicalness) or use the sunlight if it is great enough.
When thoroughly dry grind in pestal with a mortar.
And hey presto …acorn flour rich in fat and protein
(If you use hot water to leach the acorns then its a lot quicker, but removes a lot of nutritional value)
I’m really proud of this as it means I could call myself a producer, rather than just a consumer…Of course I will need to scale up.
It would be easier to find white oaks to get acorns from as they have less tanins