You can bake quince fruit once you slice it into halves and remove the core. To do so, preheat the oven to 350 degrees, place them on a baking tray (cut side up), and brush them with a mixture of fresh lemon juice, cinnamon, and sugar. Then, pour approximately a half cup of water into the baking dish and place it in the center of the oven. Bake for at least an hour until the fruit becomes fork-tender.