Lingonberries or lingonberry jam are sometimes added. It contains the commercially important cranberry, blueberry, bilberry, lingonberry, and huckleberry. There are also varieties including apples, lingonberry, cranberry and oranges. They are also known as mountain cranberry, lingonberry or cowberry. It is traditionally served with boiled or mashed potatoes, lingonberry jam and green peas. They are usually eaten with boiled or mashed potatoes, gravy, and lingonberry jam. Many meat dishes, especially meatballs, are served with lingonberry jam. It usually served with lingonberry jam and sour cream. All four variants are traditionally served with fried unsmoked bacon and lingonberry jam. Fine lingonberry jam is prepared with berries, sugar and, optionally, a small amount of water. This dish is traditionally eaten with butter and lingonberry jam. Also, typical Christmas treats have been apples, mandarin oranges, gingerbread and lingonberry jam. In Finland, whipped semolina pudding flavored with lingonberry ("puolukkapuuro") is also popular. It is commonly eaten with lingonberry sauce. Kroppkakor are served with butter or half and half and lingonberry jam.