In a large saucepan, combine the quinces with water to cover. Bring to a boil over high heat and cook, uncovered, until barely tender, about 10 minutes.
Drain the quinces and, when cool enough to handle, peel, halve, core, and cut into slices.
For the Syrup
In a saucepan or pot large enough to accommodate the sliced quinces, combine the sugar, 1 cup water, cloves, and cinnamon sticks. Place over medium heat and bring to a simmer, stirring to dissolve the sugar.
Add the quinces and additional water if/when needed to cover. .Now simmer for about 3 -4 hours. .Watch for the colour change!