My husband introduced me to this, as it grows like a weed down in Cornwall where we often go on holiday! It's a form or seaweed, it's absolutely delicious and so easy to prepare, all you do is saute it in a little bit of butter or oil. It's traditionally served with fish, but I enjoy it with anything and everything! Boasting almost no fat, this vegetable is packed with essential minerals, including magnesium, potassium, calcium and sodium. That is in addition to a healthy amount of dietary fibre and vitamin A, B, and C. Furthermore, samphire contains unique compounds called fucoidans often found in sea vegetables, which can have anti-inflammatory and antioxidant effects. It is also thought to aid sleep, digestion, bone health and the immune system. It is quite salty (high in sodium) so be wary if you have high blood pressure. I never use salt when cooking with it, it's like a natural seasoning for the rest of your meal!
You can buy it from most supermarkets.