Acorns served an important role in early human history and were a source of food for many cultures around the world.For instance, the Ancient Greek lower classes and the Japanese (during the Jōmon period) would eat acorns, especially in times of famine. In ancient Iberia they were a staple food, according to Strabo. In Korea, an edible jelly named dotorimuk is made from acorns, and dotori guksu are Korean noodles made from acorn flour or starch. In the 17th century, a juice extracted from acorns was administered to habitual drunkards to cure them of their condition or else to give them the strength to resist another bout of drinking.