This time, we dip into Japanese vinegar. There are many kinds of vinegar worldwide, like balsamic, wine, and malt. But in Japan, most vinegar is made from rice. Rice vinegar is a subtly sour ingredient that matches all kinds of Japanese cuisine and is vital in the making of sushi. We visit a Kyoto Prefecture vinegar maker that does everything in-house, even growing their own rice. We also sample a variety of dishes that incorporate vinegar, like sushi and other traditional Japanese cuisine.