tunnbröd

Etymology
From.

Noun

 * 1) A kind of very thin, either hard or soft flatbread originating in Norrland. Traditionally the dough is unleavened and made from barley or oats.
 * 2) Flatbread more generally.

Usage notes
Used to make a sandwich called a when eating surströmming. Eaten more generally as a type of bread as well.