large ripe quinces, 8 lbs. after being destemmed, depitted and cored, skin polished with kitchen towel to remove fuzz • cups, 612 grams, cane sugar or less to ferment quince juice into quince wine • yeast, 7 grams wine yeast or use 7 grams Dr. Oetker instant yeast to start fermentation • water • simple syrup (612 grams sugar dissolved in 2 liters boiling water)