Maybe I am too late, but here's a basic recipe from one of the most common Swedish cook books. Swedish meatballs, or "köttbullar".
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Intructions:
Put hot water in the frying pan after finishing frying the meatballs, to make the gravy. Put the gravy in a pot, and add the stock cube and let it dissolve. Mix the flour and the milk or water. Add that mix to the pot while stirring. Boil for about five minutes. Put in the soy and cream to your taste and season if needed.
If there is something unclear don't hesitate to ask me. English is not my native language, and I had to look up some cooking terms. Please tell me if I am making language mistakes. HTH!