Peel the apples and cut them into 6-8 wedges, avoiding smaller pieces to prevent burning during baking. Remove the cores. 1. Steam the apple for 10 minutes. 2. Transfer them to the oven and bake for 1 hour at 150°C. 3. Steam again for 10 minutes, then bake for another hour at 120°C. 4. Steam for 10 more minutes, then bake for 2 hours at 90°C. Let them cool before serving.