dulse

punalevä A seaweed of a reddish-brown color (Palmaria palmata) which is sometimes eaten, as in Scotland.
1997, ‘Egil's Saga’, tr. Bernard Scudder, The Sagas of Icelanders, Penguin 2001, page 151:

Then Egil said, ‘That happens if you eat dulse, it makes you even thirstier.’

They worked together on their father's patch: desperately, hungrily, from dawn to nightfall; dragging up dulse from the shore to nourish the stones; ... but nothing much grew except their own sense of separation.