In Trails to Oishii Tokyo, reporters from around the world discover Japan's best ingredients. This time, fermented foods like katsuobushi, the skipjack tuna flakes used to make dashi soup stock, miso and soy sauce, 2 of Japan's favorite seasonings, tsukemono pickles, a precious food source in harsh winters and sticky natto beans. All these ingredients have helped make Japanese food the world-renowned cuisine it is today. Learn how each is created with methods stretching back generations.