Quince fruits, with their unusual shape and taste, offer a special taste sensation when you cook them in a delicious dessert. As quince fruits ripen, they become yellow and soft. Select firm quince fruits from the market and allow them to ripen at room temperature. After ripening your quince fruits, prepare them by cooking the fruits until they are soft and sweet.
Pick quince fruits from the tree or from the produce section while they are green and hard. Soft and yellow quinces will become overripe and tasteless very quickly.
Place the green quince fruits into the paper bag, filling it not more than halfway. Close the bag by rolling the top edge down several times tightly.
Set the bag in a location with temperatures between 65 and 70F and out of direct sunlight.
Leave the quince fruits in the bag for two days to ripen.
Open the bag after two days and check the fruit. If the fruit is soft and yellow, it is ripe.
Place the quince fruits into a plastic bag and seal the bag. Place the plastic bag in the refrigerator to store for two to three weeks.
Disregard brown spots on the quince fruits because they will not affect the fruit's taste or quality. Quince fruits ripen similarly to pears--off the tree at room temperature. Once ripe, prepare the quince fruits by cooking them and using them in a dessert recipe, such as pie.