Granula

Granula was the first manufactured breakfast cereal. It was invented by James Caleb Jackson in 1863. Granula could be described as being a larger and tougher version of the somewhat similar later cereal Grape-Nuts. Granula, however, consisted primarily of bran-rich graham flour made into nugget shapes. The cereal had to be soaked overnight before it could be eaten.
The cereal was manufactured from a dough of Graham flour rolled into sheets and baked. The dried sheets were then broken into pieces, baked again, and broken into smaller pieces.