To freeze peeled apples, wash the apple first, then peel it completely. Core the apple and cut it into slices for the best results. Use an apple coring gadget and a peeling gadget. Tools like swivel peelers work very well at getting the apples peeled quickly and evenly. Spending more for a high-quality peeling and coring gadget is best.
After peeling, coring and slicing the apples, dip the slices one at a time into a bowl that has water and lemon juice. There needs be about a tablespoon of lemon juice per gallon of water. This helps to prevent browning while the apples are being frozen. After dipping them in the water, place the slices on a baking tray that is lined with parchment paper.
Put the tray in the freezer for a couple hours first. This helps prevent the slices from sticking together when frozen since they are pre-frozen as separate slices. After a couple hours, remove the slices from the baking tray and place them in a freezer bag or plastic storage container with the lid on.
Look for the sweeter varieties, such as gala and Fuji apples when selecting apples to freeze. These retain their sweet flavor better when frozen. Keep the apples in the freezer for 6-9 months.