Twice-cooked, and named for it. Biscuit comes through Old French from Latin bis coctus, twice-cooked, and this is the food that earned the name. Roman armies carried bucellatum; every European navy of the age of sail ran on ship's biscuit; Union and Confederate soldiers ate it by the crate and called it hardtack, tooth-dullers and worm castles. It is arguably the single most consequential preserved food in history, because a ship's range is set by how long its provisions last, and nothing else combined that shelf life with that much energy per kilogram.

Every omission is deliberate. Fat is what makes ordinary baked goods pleasant and it is precisely what spoils — unsaturated fats oxidise and turn rancid, so a food meant to last years cannot contain them. Leavening creates a light open crumb, which is a large internal surface area and a lot of trapped moisture. Water is what mould and bacteria need; below roughly ten per cent moisture content almost nothing can grow. Hardtack is a food engineered by subtraction, and its awfulness is the direct price of its shelf life.

The weevils were real, and so was the routine. Ship's biscuit was reliably infested with the larvae of biscuit beetles and weevils, and the standard practice — tapping the biscuit on the table to knock them out, or eating in the dark — appears too consistently across independent accounts to be folklore. Infestation was tolerated as normal; genuine spoilage from damp was the serious problem, because a wet biscuit store could rot an entire voyage's provisions.

What it could not do. Hardtack solved calories and it solved shelf life. It did nothing about vitamin C, and scurvy killed more sailors in the age of sail than combat and shipwreck combined. James Lind's 1747 trial pointed at citrus, but the Royal Navy did not adopt lemon juice service-wide until the 1790s, and the reasoning stayed muddled for decades after — the actual vitamin was not identified until the 1930s. The biscuit is a triumph of food preservation and simultaneously a demonstration that preservation and nutrition are different problems.

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