SEA SPAGHETTI BROWN ALGAE
Sea spaghetti (Himanthalia elongata) is a brown seaweed that grows in long, narrow straps — olive-green, slightly flattened, and genuinely pasta-like in both appearance and behaviour. It's one of the better eating seaweeds on the British and Irish coast, and one of the easiest to work with if you've never cooked seaweed before.
What It Looks Like
Sea spaghetti has an unusual life cycle worth knowing about. The plant starts as a small button — a squat, mushroom-shaped disc a couple of centimetres across, sitting on the rock. The long straps everyone recognises grow out of that button later, and can reach two metres or more.
Those straps are actually the reproductive structure rather than the main body of the plant. They appear in spring, mature through summer, and die back afterwards, leaving the button behind to produce more the following year.
It grows low on the shore on wave-exposed rocky coasts, so it's accessible only on good spring tides.
What It Tastes Like
Mild and clean, with a light brininess and a faint sweetness. It's much gentler than the kelps and nothing like as strong as wrack.
Texture is the real appeal: firm, with a proper bite that holds up to cooking. Blanched briefly it goes bright green and stays al dente, which is why the pasta comparison sticks.
How to Use It
- As a pasta substitute — blanched for two or three minutes and dressed. Works with garlic, chilli and oil, or a light tomato sauce.
- In salads — blanched, cooled and dressed with rice vinegar and sesame, or with lemon and good olive oil.
- Stir-fried — holds its texture at high heat better than most seaweeds.
- Pickled — the firm texture takes well to a light vinegar pickle.
- In soups — added towards the end so it keeps some bite.
Dried sea spaghetti rehydrates in about fifteen minutes and expands considerably, so start with less than you think you need.
Harvesting
Cut the straps and leave the button intact — that's the part that regrows, and taking it ends the plant. Harvest in late spring and early summer while the straps are young and tender; by late summer they toughen.
Take from open coast with good water movement, and take only a proportion of what's growing.
Nutrition
Sea spaghetti contains dietary fibre, vitamins C and K, and minerals including calcium, magnesium, iron and iodine, along with a useful protein content. Iodine levels are moderate — lower than the large kelps but higher than the green seaweeds.
Commercial Harvesting
Sea spaghetti is harvested commercially in Brittany and along the Irish west coast, where it's one of the more established seaweed crops. Because the straps regrow annually from a persistent base, well-managed harvesting is relatively sustainable — provided the buttons are left alone.
Related
Sea spaghetti sits with the brown seaweeds alongside alaria and sugar kelp. See our guide to edible seaweed in the UK, or the full guide to edible seaweed.
Seaweed has been a source of savoury flavour for centuries. Sozyë's sauces are brewed from a blend of wild Scottish seaweeds, harvested off the north coast of Scotland.