http://www.atlasobscura.com/articles/solving-the-nutritional-mystery-of-historical-food-at-sea
That reminds me, I'd always meant to order a copy of this book.
http://www.amazon.com/Lobscouse-Spotted-Dog-Gastronomic-Companion/dp/0393320944 (http://www.amazon.com/Lobscouse-Spotted-Dog-Gastronomic-Companion/dp/0393320944)
Myabe I'll whip up some period appropriate food for the next Sails of Glory session.