Peel and roughly dice the kiwi with lemon juice, orange juice and sparkling wine and weigh 1 kg. Bring to the boil with the preserving sugar in a large saucepan and cook through and through for about 4 minutes. Make a gelling test, if negative, add 1 packet of citric acid and briefly bring to the boil again. Skim if necessary and fill to the brim in prepared jars and close immediately. Place on the lid for about 5 minutes.