Step 3: Swirl in the Lingonberry jam. Ebelskivers aren’t complete without a dollop of lingonberry jam, so we added a swirl to our pints. Lingonberries are staple in Scandinavian food, and are best known here in the states by their prominence at IKEA (IKEA sells lingonberry sauce by the bucket). A cousin to the cranberry, the lingonberry is slightly tart in taste, and most often served in jam or jelly form.