What is carrageen used for?

Setting. Carrageen's cell walls are rich in carrageenan, the shore's own gelatine: simmered in milk it sets the traditional carrageen pudding, panna cottas and silky plant-based desserts — no packet gelatine required.

How do you make carrageen pudding?

Steep a good handful of washed carrageen (fresh or dried) in a pint of milk, simmer gently 15–20 minutes until the milk thickens and turns silky, strain pressing well, sweeten with honey or sugar and a little vanilla, then chill until softly set.

What is the difference between carrageen and false Irish moss?

Both are small red fans of the lower shore and both set a pudding. True carrageen (Chondrus crispus) is flatter with fan-like forks and often a blue iridescence underwater; false Irish moss or grape-pip weed (Mastocarpus stellatus) is channelled, stiffer, with tiny pips on the frond. Foragers use them interchangeably.

Carrageen (Irish Moss) — Identification & the Pudding

By Jayson Byles, forager & chef · Updated August 2026

Carrageen (Chondrus crispus) — Irish moss — is the little red workhorse of the lower shore: flat, fan-shaped fronds a hand-span tall that fork and fork again, red-purple in air and often shimmering blue-violet underwater. It matters for one great reason: it is the seaweed that sets — the shore’s own gelatine, and the heart of a pudding tradition stretching back centuries on both sides of the Irish Sea.

How do you identify carrageen?

Small, flat, cartilaginous fans forking evenly from a narrow base — picture a tiny red gingko forest — on rock from the lower mid shore down, at spring-tide reach. Underwater the tips often flash an unmistakable blue iridescence. Its double, false Irish moss (Mastocarpus stellatus, the grape-pip weed our field guide mentions), is channelled and stiffer with little pips along the frond — and happily, the kitchen treats them as one.

Where and when to find it

Lower shore rock, best reached on spring lows. Traditionally gathered through late spring and summer, then dried — and sun-bleached through dew and rain, which mellows both colour and flavour — to keep the pantry set for the year. Cut fronds, leave the base, take a third.

The pudding — and everything else it sets

Simmered gently in milk, carrageen releases carrageenan and turns the pot silky; strained, sweetened and chilled, it sets into the soft, delicate carrageen pudding — our carrageen panna cotta with berry sauce (a workshop favourite in the gallery) is the same magic dressed for dinner. It thickens soups and stews, sets plant-based desserts without gelatine, and a strip in a simmering pot adds body the way a bone might. Quiet seaweed; serious skill.

The fastest way to learn a seaweed is to meet it on the rocks with someone who harvests it weekly. Join a workshop on the East Neuk shore — dates and booking here — or take home Jayson’s 52-page e-book Thriving in the Intertidal.

Carrageen (Irish Moss)

How do you identify carrageen?

Where and when to find it

The pudding — and everything else it sets

Notes from the shore