Theory number two: maybe, in Lightoller’s British English, he was actually referring to a cookie? Theory number three: ‘Frisco biscuits were a form of hardtack. Since sourdough wouldn’t have been a ...

Those biscuits were actually hardtack, those extremely hard crackerlike discs that were baked to oblivion so they'd last on ...

Included in the World War One section are hard tack biscuits, which were made from flour, water and a small amount of salt, and were baked until they were very tough. "If you tried to eat them ...