1. To make apple crisps, first wash the apples, peel them, remove the core, and cut them into 0.2 cm thick slices. Soak the slices in water and squeeze a few drops into the water. Lemon juice prevents the apple slices from oxidizing.

2. Banana crisps are similar to the process of making apple crisps. First, peel the bananas and cut them into thin slices. They can be placed directly on a baking sheet lined with tin foil without soaking, and then take some Sprinkle the white sugar evenly on the banana slices and place them in the baking pan for baking.

3. For pineapple slices, remove the outer skin, wash and cut into thin slices less than one centimeter, put it in a basin with warm water, sprinkle a small amount of salt, stir it a little, and let the pineapple soak in the salt water. Soak in medium for 20 minutes to remove the astringency.

4. For purple potato chips, first wash, peel and cut the raw purple potatoes into thin slices of about five millimeters, dry the water from the slices, and then spread the slices one by one on the plate. The sheets should not be next to each other to avoid sticking.