If you see any acorns starting to brown too much, turn the oven off and leave the acorns in there. They will still “cook.” You’ll want to leave the acorns in the oven for about 1.5 – 2 hours.

Once properly leached, the whole nuts can be left to air dry or roasted in the oven. To make acorn flour, you can pulverize the peeled nuts in a blender with water, then rinse and squeeze out the ...