The meatballs themselves are quite simple; it is the gravy and the classic condiment, lingonberry jam, that distinguish them from others. In my version, I use creme fraiche in place of the traditional sour cream to make a more voluptuous but slightly less tangy version. I also use homemade stock. You may use commercial beef broth, though the flavors and texture won’t be as good. To serve these meatballs as a main course, add steamed or roasted potatoes, tossed with plenty of good butter, alongside.