In researching my Dothraki wedding feast, I came to the conclusion that, statements of GRRM about composite cultures aside, I wanted to make Mongolian-esque food.
This of course required the use of Soy sauce. But would that be proper? What exactly is this delightfully salty sauce and would a Dothraki Horde have access to it?
The good folks over at the Kikkoman Soy Museum have put together a nice condensed history of soy sauce, but the take home point is that soy sauce (the American and British name derived from the Japanese term "Shoyu" or "Shio") is an ancient method that served the two very important purposes of both preserving perishable foods and enhancing the flavor in an economical and efficient manner given the high cost of pure salt.
For more on Salt, and the history of Salt, including a great discussion of the history of soy sauce and the many wars fought over the salt trades, I highly recommend this book. All the salt and history you could ever want, and more!