The fruit of the oak tree. Some types are edible and are eaten by certain Asian peoples before they discovered cereals. In some countries, such as Spain, acorns are eaten raw or roasted. Acorn flour, which unlike chicory has costive properties, is used as a substitute for coffee. For this purpose, the roasted acorns of the ballota oak are most commonly used.A nut that is grown and harvested from the oak tree. Generally, the acorn is not often eaten, due to their higher levels of tannins, which provide a bitter taste to the nut. The tannins can be removed by continually boiling the nuts in fresh water. This removes the tannins, which color each batch of new water. The majority of tannins are removed when the boiling water is no longer colored.
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