Kroppkakor are traditional Swedish dumplings made from boiled potatoes and filled with a mixture of chopped onions and pork. They are typically shaped into large round balls and served with lingonberry jam, butter, and sometimes cream. Kroppkakor are a beloved dish in Sweden, particularly in the province of Öland. They are known for their rich and hearty flavor, making them a must-try culinary delight when visiting Öland.