Shiitake — the star Japanese mushroom known for its strong umami. Visit a farmer who uses centuries-old cultivation methods to conserve the natural surroundings, then head over to our reporter's hometown in Sweden to see how shiitake have grown in popularity overseas. We'll be cooking up all kinds of mushroom dishes, from Scandinavian to French to Japanese. (Reporter: Janni Olsson)

Seri, in season from winter to spring, was a key source of nutrition during harsh winters when produce was scarce. It grows in cold, mineral-rich water, giving it a delectable crunch and aroma. Join our reporter in muddy, flooded paddies for a harvest experience and check out a local dish that took on an iconic role in post-earthquake recovery. Also visit TOKYO SKYTREE for seri Italian dishes that are truly inspired. (Reporter: Kyle Card)

In Japan, there's a type of sugar for nearly any recipe. Among them, wasanbon is perhaps the most precious, as it's produced in only six refineries in the country's Shikoku region. The secret to its quality lies in a traditional method practiced since the Edo period. See the magic happen for yourself, and feast your eyes on all kinds of food that call for Japan's special sugar. (Reporter: Kailene Falls)