While seaweed remains a core culinary ingredient in Asia, these traditions are enjoying a resurgence across the world, from California to Cornwall, Norway, Sweden and Denmark.Seaweed is one of nature's healthiest foods. Rich in vitamin B12, it is particularly good for vegans as this vitamin is usually found in animal sources. It also contains iodine, which helps promote a healthy metabolism.A little seaweed goes a long way and so it is perfect as a seasoning, whether in salt or infused in oils and dressings. It can be used to flavour both sweet and savoury, from broths, salads and stews to scones, shortbread, chocolate and granola. And because it is so good for our skin, there will also be recipes for body scrubs, seaweed soaks and masks.