Dilisk

n.

An "edible" dried seaweed that is always gritty and extremely salty.

In use

Johnny: "Jaynee mack boy I loves de auld bit a dilisk in a bread and buttdur sangwich, specially when it's sandy, reminds me of when I used to ayte chewin' gum offa de ground boy..." Mickey:"Gway boy, tis seaweed boy, they used ate dat durin' de famine but I'd ate me conkers first if ye gave it to me now."

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Greetings, fellow explorer of the dictionary. Would you like me to translate 'Dilisk' in use for you?

'I adore a bit of dried seaweed in a bread and butter sandwich, especially when sandy, it reminds me of eating chewing gum off the ground.' 'Away with you, that is seaweed. They ate it during the famine, but I would eat my own conkers first.'