In reply to Justin:
Now is the time to gather acorns
peel off the skins carefully (if you do it right , in equal halves and then make holes they can make bizarre monster eyes you can wear to terrify friends and colleagues)
Chop them into small pieces and then put on a baking tray and heat in oven till they are roasted but not burned. Then grind them uo and roastthem a bit more
makes a drink not totally unlike coffee aith no caffeine.
I have done this for myself and it works. People used as a coffee substitute during the war