Konnyaku Green Seaweed 200g (16 ratings) Konnyaku Green Seaweed 200g £1.60 Out of stock. 0 in your basket View Basket Checkout Cook from cold water: Konnyaku lose more moisture with this method. Hence, the texture will be firmer and chewier. Once boiling, cook for 2-3 minutes and drain. Cook in boiling water: Cook in boiling water for 2-3 minutes. The unique smell will go away and the texture will be more giggly and tender. Ingredients Konyaku Purified powder, Calcium Hydroxide (E526), Seaweed Powder (Green Laver Powder), Water.