A disgruntled staff member?
Black Icelandic humor?
We will probably never know.
This was reported today from THE ICELAND WEATHER REPORT on facebook:

Too funny: a package of ground beef was found in the meat section at Krónan in Mosfellsbær. The label reads as follows:

100% ground steer beef
Fat content 10-90%

110% Icelandic ground steer beef from a Danish pig or a mountain lamb that was raised in Bulgaria but moved to Spain in its senior years.

The meat has been kept in frozen storage in Australia, Pakistan, Holland and elsewhere.

Contains: 50% cow meat and 50% potato filament.

100% ICELANDIC PRODUCT

(And the picture text):

Not worth a Krona - don't pay!