This dried purple-red seaweed has been eaten as a chewy, salty snack along Ireland's Atlantic coast for so long that it shows up in medieval Irish texts.
Hand-harvested seaweed is sun-dried until leathery and deep red-purple, then sold in small bags to be nibbled straight, or fried briefly for a crisper texture. Market stalls around Mayo and Sligo's coastal towns sell it dried, much like a bag of crisps.