"Ooh, go on then, just a gnurt"

I saw this letter in the Times yesterday and it made me smile:

Hard cheese
Sir, My father, being of Orcadian stock, would use the word “gnurt” (silent G) to describe a small piece of food . To be precise, a gnurt was the exact quantity of cheese required to cover a buttered oatcake.
MAGNUS K. MOODIE
Edinburgh

Definitely a word to drop into conversation...