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The name is derived from “tack”, the British sailor slang for food. The introduction of the baking of processed cereals, including the creation of flour, provided a more reliable source of food. As the biscuits would soften and become more palatable with time due to exposure to humidity and other weather elements, the bakers of the time made biscuits as hard as possible. Because it was baked hard, it would stay intact for years if kept dry. To soften, hardtack was often dunked in brine, coffee, or some other liquid, or cooked into a skillet meal.
Hardtack, crumbled or pounded fine and used as a thickener, was a key ingredient in New England seafood chowders from the late 1700s. In 1801, Josiah Bent began a baking operation in Milton, Massachusetts, selling “water crackers”, biscuits made of flour and water that would not deteriorate during long sea voyages from the port of Boston. With insect infestation common in improperly stored provisions, soldiers would break up the hardtack and drop it into their morning coffee. This would not only soften the hardtack but the insects, mostly weevil larvae, would float to the top, and the soldiers could skim off the insects and resume consumption.