This means lava in Icelandic (like in the infamous Ódáðahraun lavafield) and it is one of those words I'm not aware of knowing until they pop into my mind constantly. With this word it happens whenever I look at this dish.
Its bubbles and crustiness remind me of boiling lava, now cooled down and frozen. The process this piece passed through is still visible and I love this very much. It's one of my favourite glass experiments so far.