Barley bread
Encyclopedia
Barley bread is a type of English bread which dates back to the Iron Age
Iron Age
The Iron Age is the archaeological period generally occurring after the Bronze Age, marked by the prevalent use of iron. The early period of the age is characterized by the widespread use of iron or steel. The adoption of such material coincided with other changes in society, including differing...

. It requires barley flour, which is relatively difficult to obtain.
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