Answer:
hardstack/cracker
Explanation:
i did some research
Aug 28, 2019 — He invented "Granula" in 1863 - fifteen years before Kellogg. ... Hardtack (sometimes called a "cracker" or "ship's biscuit") was a common sight on ... Made of just flour, water, and salt, hardtack was, well, hard. ... Some rusks, like zwieback, were even yeast-leavened sweet breads that were twice baked.
this is from one of the articles I found, not my work
