Peel the 4 quinces and cut them into cubes.

Boil them until soft, adding 1 cup of water.

Pulp them and add  ½ cup sugar for each cup pulp.

Boil without adding any water and stirring using a wooden spoon until it pulls away from the walls of the pot.

Spread the mixture on parchment paper.

Leave it to cool and then cut it.