Kelp is a plant that players can find growing underwater in the Mogre Camp. They will need to speak to Murphy at Port Khazard to enter.
Players can pick the leaves from the kelp plant, and grind them down with a pestle and mortar to make ground kelp, which can be used to make a raw fishcake. This is required to complete the Pirate Pete section of the quest Recipe of Disaster and awards the player with 1 Cooking experience. Kelp can also be cooked to make soda ash. This type of kelp cannot be used to make sushi.