Japan has over 20 types of edible seaweed, but wakame is by far the most frequently eaten. Packed with vitamins and minerals and easily preserved, wakame is both healthy and handy. Our reporter visits an area where wakame is cultivated, discovering how farmers are battling climate change, and eats some delicious wakame-based dishes. Discover why this edible seaweed has been called a "miracle vegetable from the sea".