The Booth Family are in Shikoku... not for the famous Udon noodles of Kagawa Prefecture, but for the soy sauce, the byword for Japanese seasonings. They visit a long-established soy producer operating out of a stunning old house that had been built for a member of the warrior class. There they are greeted by a man who is the descendent of a warrior family. He describes the involved process for brewing soy sauce and the company's new products.