Dashi Kombu is dried Seaweed, made from dried Japanese kelp, is rich in fiber, vitamins and minerals such as iodine and calcium. Dashi Kombu is used to make a salty and very flavorful base for Japanese soup stocks. Its low calorific value, coupled with its Umami flavor makes it ideal for broths, stews, and as a wrap for certain sea foods. Just break off a 4-6 inch piece, simmer in hot water. Don't boil it. Then let it steep for 5-30 minutes.