Seaweed Super Soup

Captain Captain is in a grumpy mood because she hasn't had her pre-game feast. She calls on Cook and Line to feed her, at which point they proudly present her with some of Cook's disgusting seaweed porridge. Captain Captain orders him to make something else, something delicious. Later on, Cook reveals his new dish: seaweed super soup. Captain Captain is doubtful of cold seaweed soup, but once she tries it she realises that it is the most delicious thing she has ever tasted. It's so good, she wants Cook to make some more so she can sell it to other pirates and get rich. A huge list of her pirate friends send in orders for the delicious soup. Cook's new batch is almost ready and he has only one final ingredient to add, seaweed. Unfortunately, there is not a single piece of seaweed left on the whole island. How can they make seaweed super soup without seaweed?