Peel and core the apples, then chop them into tiny cubes.
Add the chopped apples and water to a pot. Cook until the apples are completely soft and mushy.
Using a hand blender, blend the cooked apples into a smooth, silky purée.
While the apple purée is still warm, add the vanilla paste, if using, and the gelatin. Blend again until the gelatin is fully dissolved.
Pour the warm apple mixture into the bowl of a stand mixer.
Whip the mixture until it becomes fluffy, increases in volume, and forms soft peaks.
Spread the glossy pink perfection apple mixture into a parchment-lined loaf pan.
Transfer to the refrigerator and chill until completely set.
Remove from the pan, slice into pieces, and serve.