Noun
bread made of coarse rye flour
Source: WordNetI had this cliché moment of a Russian émigré abroad: I really missed black bread. I know it's stupid, but I really missed it. Alexei Navalny
The necromancer might also surround himself with morbid aspects of death, which often included wearing the deceased's clothing and consuming foods that symbolized lifelessness and decay such as unleavened black bread and unfermented grape juice. Source: Internet
Strictly speaking, gira can be made from anything fermentable — such as caraway tea, beetroot juice, or berries — but it is made mainly from black bread or barley/rye malt. Source: Internet