Swedish meatballs aren’t exclusive to a certain Scandinavian furniture store. Called köttbullar, they’re beloved throughout Sweden, especially at the holidays. Gently spiced with allspice and nutmeg, they double as a warming main course, or a passed appetizer for an easy cocktail party. If you feel up for entertaining, serve them with the lingonberry jam and toothpicks for guests to help themselves; save the gravy and mashed potatoes for dinner the next night. For the ultimate gravy, add the yogurt slowly, at room temperature, or the sauce can break.