Lingon berries have a delicious flavor combining sweetness and tartness. They have ripened in the intense summer of northern Sweden, where the summer sun never sets. They are small, firm berries with a slightly sweet and sour flavor. Lingonberry Preserve is a traditional Scandinavian food with an exotic flavor. Felix Lingonberry Preserve is made in Sweden and is a delicious alternative to tart jams and preserves, such as currant or raspberry.