Group 1 - The article discusses the popularity of kelp as a food item and its common presentation in various dishes like hot pot and spicy soup [1] - Kelp is often tied in a knot for easier transportation and storage, improving its visual appeal for consumers [2] - Knotted kelp is easier to pick up with chopsticks and helps prevent it from sticking together during cooking [3][4] - Cooking kelp in a knot helps retain its nutritional value, particularly iodine, which is sensitive to high temperatures [5][6]