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Foraging for Irish Seaweed

Find out how best to use this natural resource.

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Irish seaweed is one of our greatest native resources but we don’t use it enough in our cooking. In the first part of our new foraging series, we’re going to look at seaweed, how to forage it, use it and more.

Seaweed is popping up on menus all over the world and we’re even starting to see some seaweed-based products, like crackers and crisps, appear in supermarkets. Seaweed has been described as the most nutritious form of vegetation on the planet and considering Ireland is an island, we should be eating heaps of the stuff, but it seems like a lot of the population are unaware of it. As an indigenous product, Irish people should try to embrace seaweed more, to help turn away from imported goods with less flavour and more air miles.

In terms of nutrition, seaweed is a superfood: it’s packed with minerals, vitamins and antioxidants. Seaweed has more antioxidants than raspberries, twice as much Vitamin C as orange juice, ten times as much calcium as cow’s milk and fifty times more iron than spinach. It also adds a fantastic umami flavour to any dish it’s in, creating delicious savoury notes, as well as helping you to feel fuller for longer.

Read more: Black pepper squid

Seaweed salad, Getty Images
Seaweed salad, Getty Images

While seaweed can be shop bought, it’s also very easy to forage as it is literally all around us. However, it’s important to note that we need to respect the environment as we forage, meaning we can’t all head off to the seaside with a bucket. In order to ensure that seaweed regenerates, don’t pull it straight from the rock: Several inches needs to be left on the plant when it’s cut in order for it to grow back again. Seaweed is integral to the complex ecosystems of the sea, so when foraging it, take only a little from here and there in order to ensure you preserve the area.

When foraging, it’s also important to be mindful of the water quality: is there pollution in the area or is the water stagnant? If the answer is yes, then it’s best to pick from a different area. Only seaweed that is still attached to rocks should be cut, as any that washes up on the shore is usually old and dead.

When foraging, rinse the seaweed in the water to try and remove sand, then when you get home, wash it thoroughly in fresh water. Drying seaweed is the best way to ensure its quality, as it usually reconstitutes well with a more intense flavour. By drying the seaweed in natural sunlight, you ensure that more vitamin D is kept in the plant, but dehydrators, hot presses or fan ovens at low temperatures are great alternatives.

Dr Sally McKenna, a seafood expert and one half of the team behind the McKenna's Guide's, has given us some tips about foraging seaweed:

  • Find out the time of the low tide, and forage for seaweed as the tide is ebbing (going out). A good app for this is World Tides 2019.  
  • Never turn your back on the tide, as you could easily find yourself on a rock with water cutting off your route back to shore. Once the tide turns, it comes back in surprisingly quickly.
  • Try to go out with three people, or if you are on your own, let someone know you are gone and tell them to expect a call to say you are safely home. Rocks are slippy, so be careful.
  • The seaweed will always be in the same place in relation to the tide: the kelps will be in the deepest water and only accessible just at the time of the full moon and the new moon. At the top of the tide is the channelled wrack, which is a lovely seaweed to forage for, because you can find it easily. It’s smallish seaweed that grows abundantly at the top of the intertidal zone (the beach). In between, you can search for various wracks, carrageen, dulse, pepper dulse, sea noodle, sea lettuce, sea spaghetti and many other varieties. Use a good book to help you identify, but seaweed is not like mushrooms - in Ireland there are no really dangerous ones that are full of poison. 
  • Only take what you know you will use. Bring a small plastic bag, and only cut the very top third of each plant. Always use a knife or scissors, never pull!

Read more: Grilled squid salad

Seaweed on seashore, Getty Images
Seaweed on seashore, Getty Images

Dr McKenna also gave us a guide to preparing seaweed after you've foraged it:

  • Seaweed needs no special preparation, you can literally eat it straight out of the sea, and I always snack on it as I forage.
  • If you want to dry it before storing it, just place on a rack or even peg on a washing line, and it will dry quickly. The dashboard of a car is actually a great place to dry seaweed, it will almost be dry by the time you get home.
  • Washing seaweed with fresh water is useful for removing sand and also watch out for little sand hoppers, or sea fleas, who are your co-foragers on the beach.
  • Dried seaweed just needs to be rehydrated for a couple of minutes. If you buy some dried sea salad, for example, just place in some water and then spin in a salad spinner and you’re ready to go.
  • Seaweed doesn’t need cooking, but it’s a good idea to first plunge it in some boiling water. It is magical to watch the seaweed go bright green the second it hits the water. It suddenly looks a whole lot more palatable.
  • Cooking softens the tougher seaweeds, like kelp, and makes them very easy to eat. Add some sugar kelp or kombu to a long-cooked casserole and it adds an umami flavour, as well as making a fantastic, tasty vegetable.
  • Seaweed is often sold as ‘sprinkles'. These need no additional preparation - just scatter them on top of rice, eggs, fish or add to bread.

To get a better idea about seaweed in cookery, we spoke to Takashi Miyazaki, Michelin-starred chef, who uses seaweed frequently in his Japanese cooking at Ichigo Ichie and Miyazaki.

“I use seaweed quite a lot in my cooking, depending on the season. I use Japanese kombu when I’m making dashi, because it’s of a different quality to what’s available here, but I use Irish seaweed in many other ways. I use pepper dilisk as a seasoning in tuna or beef tartare because it has such a great peppery taste. It’s in season now and can be found in cold water all around Ireland. The key to foraging seaweed is to check tide tables. Seaweed can be found at different times: for instance, kelp is only found at very low tide, so the tables are very important.”

Read more: Takashi Miyazaki's guide to Japanese ingredients

There are countless varieties of seaweed but let’s take a closer look at three of our favourites: dulse, carrageen and nori.

1. Dulse

Known as both dillisk and dulse, this can be eaten raw, fresh or dried and is popular for its salty, nutty taste. It can be reddish brown or a very dark red, with a tough and leathery texture. It’s is a great source of protein, calcium and iron. Dulse can be eaten raw but is also great when added to champ, soups, stews and salads.

Dulse, Shutterstock
Dulse, Shutterstock

 2. Carrageen

Carrageen, which comes from the Irish word carraigín meaning “little rock”, is a species of red algae that grows in the cool Atlantic waters along the rocky coastlines of Europe. Carrageen is normally harvested after the spring tides when the water is farthest from the shore so that foragers can head out into the shallow waters and rake up the seaweed by hand. Also known as Irish moss or carrageen moss, it is commonly used as a thickening agent due it its naturally high levels of gelatine. Carrageen is only edible after being cooked in liquid and is wildly available in dried form. It’s known as a remedy for colds and flu, and was traditionally dissolved in milk.

Carrageen, Shutterstock
Carrageen, Shutterstock

3. Nori

Nori, which is famous for its use in sushi-making, is the Japanese name for a type of red algae. It is frequently used in Japanese and Korean cooking and was traditionally thought of as an aphrodisiac and a treatment for gout. To make the sheets of nori that we’re most familiar with, the nori is processed thinly before being packaged and used to wrap sushi. Nori can also be added to food for extra flavour and crunch – it’s particularly good when sprinkled over chicken before it’s roasted.

Nori sheets, Shutterstock
Nori sheets, Shutterstock

If you want to learn more about seaweed, we highly recommend you check out Sally McKenna’s book ‘Extreme Greens’, it's our favourite guide for when we want to learn more about our native varieties. If you're looking to buy seaweed, instead of foraging for it, head to This is Seaweed, Irish Seaweeds, Wild Irish Seaweeds or Connemara Seaweed Company.

We have three copies of Extreme Greens by Sally McKenna up for grabs, click here to be in with a chance to win. 

If you want to incorporate seaweed into your diet, try out Takashi's recipe for soba noodle soup with wakame or Sally's recipes for seaweed and sesame salad and mussel, coconut and kelp soup.