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The nut from European Beech.
Of course here in central europe, this tree is really common, and when you go in forest, it is easy to find these in the autumn.
If you find the ones that are fully grown, they can be quite good, and as good as any other nut, although smaller.
Also wild blackberries, blueberries, starberries, raspberries.
I almost forgot to mention edible mushrooms, mainly from the boletus genus.