Trails to Oishii Tokyo Season 5 Episode 1 SHIITAKE ( Air Date 2023-01-25 ) Genre Documentary category. Overview "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.".