What cereal is used to make black bread?

Black bread is a type of bread made from rye flour, which is derived from the rye grain.

It's important to distinguish between cereal and grain.

* Cereals are grasses cultivated for their edible grains.

* Grains are the seeds of these grasses.

While rye is a grain, it's not considered a cereal grain.

So, to clarify, black bread is made from rye flour, which is a grain but not a cereal.