"Labskaus" (in Norwegian "lapskaus") is a very common dish also in Scandinavia. I once heard that the word "scouse" actually derives from the Norwegian use of the word. But this may be a myth.
In Norway, which had a long sea-trading association with the Northern English seaports, the dish (known locally as lapskaus) is virtually a national dish using the weekend's remaining food, usually carrots, potatoes, pork sausages in slices or beef cut small and served with flatbrød (unleavened bread dating back to Viking days)
Some of the statements in this page support my theory that the Norwegian dish "lapskaus" was the origin of the term "scouse".