Tart apples are often peeled for pie to create a smoother texture and balance their acidity, while sweet apples are often left unpeeled in salads for added texture, color, and nutrients.
The decision to peel or not peel apples depends largely on the type of apple and the dish being prepared. Tart apples, like Granny Smiths, have a thicker, tougher skin that can remain firm even after baking. This can result in an undesirable texture in a pie. Peeling them removes this tough skin, allowing the apple to soften completely and blend seamlessly into the pie filling. Additionally, the tartness of the apple is concentrated in the skin, so peeling helps to mellow the flavor and create a more balanced sweetness in the pie.
Sweet apples, on the other hand, such as Galas or Honeycrisps, have thinner, more delicate skins that are perfectly palatable. Leaving the skin on adds a pleasant crunch and visual appeal to salads. The skin also contains a significant amount of fiber and nutrients, so keeping it on boosts the nutritional value of the salad. Furthermore, the sweetness of these apples is generally well-balanced, so there's no need to remove the skin to adjust the flavor profile.
If you choose to leave the peel on apples for any dish, be sure to wash them thoroughly to remove any wax or residue. Consider using an apple peeler for quick and easy peeling when needed.