In the US, hard bread is often called hardtack. The National Park Service publishes a simple recipe: https://www.nps.gov/mana/learn/kidsyouth/hardtack-during-th

In the US, hard bread is often called hardtack. The National Park Service publishes a simple recipe: https://www.nps.gov/mana/learn/kidsyouth/hardtack-during-the-civil-war.htm https://www.nps.gov/mana/learn/kidsyouth/hardtack-during-the... . Here's another one from Australia: https://herreshoff.org/2020/04/a-recipe-for-hardtack/ https://herreshoff.org/2020/04/a-recipe-for-hardtack/ . The only real question is which kind of flour to use. I'm sure it ought to be whole wheat or a blend of whole wheat and white.