Seaweed is usually used in making gimbap, a Korean dish made from steamed white rice (bap) and rolled in gim (sheets of dried seaweed) and served in bite-size slices. Dried seaweed is so popular in Korea that natural collection of seaweed was not enough to meet demand. Hence, seaweed cultivation technique developed between the 17th and 19th centuries, making Korea's seaweed aquaculture one of the most advanced in the world.