So to get a bit of christmas feeling I suggest you try some seasonal specialties:
Rödvinsglögg is red wine with christmas herbs (cinnamon, cloves, ginger, cardamom seeds, orange peel) you can buy it on Systembolaget. Make sure you buy starkvinsglögg (the alcohol % is important)
Should be served hot in a coffe glass where you also add in raisins and almonds (boiled in order to soften them up and get the skin off).
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Snacks to be served with the glögg is pepparkaka (pepper cookie) looks like this
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or like this in your ICA shop
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Swedish christmas buffet:
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Various kinds of herring (pickled herring, onion pickled herring, mustard herring, garlic herring, tomato herring ) smoked salmon, collared brawn, head cheese/fromage, meatballs, small sausages, homemade sausages , christmas ham, smoked pork belly, spare ribs, Jansons temptation, beetroot sallad, seafood sallad and various kinds of bread to mention some of it.
I checked a few restaurants, they don't serve it as buffet this year but instead serve you at your table, I would choose Fiskekrogen (not far from The British Shop) 695 or 895 SEK. Yes I know but there's only christmas once a year.
Some restaurants have home delivery for the lonely souls but then you are not able to eat as much as you want..