Traditionally served on the Christmas smörgåsbord, sillsalat is a Swedish salad that combines finely sliced or minced pickled herring with diced boiled potatoes, pickled beets, pickles, apples, and chopped onions. All the ingredients are placed in a large bowl and tossed lightly with a sour-sweet dressing made with vinegar, water, sugar, pepper, and (optionally) cream or yogurt.