I've gotten hungry from all this smørrebrød talk..
I should make some food.
Yes, it can be all kinds of stuff on them. Shrimps is not among the most common things though.
Sol over Gudhjem doesn't which is one of the most common. Neither does Dyrlægens natmad.
Stjerneskud can have shrimps on it, but it isn't necessary.
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Its just called Räkmacka here.