Another new Viking recipe I've been working on...

Saute some leeks in butter, along with diced carrots and rutabegas.  When just starting to soften, take off the heat.  When they are cool, mix with some sour cream. 

Very reminiscent of the modern Scandinavian beets in sour cream.  The rutabegas come out very sweet, and stand in well for the beets, which aren't Viking period. 

This was a big hit with pretty much everyone, including a number of avowed root-vegetable-haters.  It went well with the barley bread.