Bappir

Bappir was a Sumerian twice-baked barley bread that was primarily used in ancient Mesopotamian beer brewing. Historical research done at Anchor Brewing Co. in 1989 (documented in Charlie Papazian's "Home Brewer's Companion" ()) reconstructed a bread made from malted barley and barley flour with honey and water and baked until hard enough to store for long periods of time; the finished product was probably crumbled and mixed with water, malt and either dates or honey and allowed to ferment, producing a somewhat sweet brew. It seems to have been drunk with a straw in the manner that yerba mate is drunk now.
It is thought that bappir was seldom baked with the intent of being eaten; its storage qualities made it a good candidate for an emergency ration in times of scarcity, but its primary use seems to have been beer-making.