Preheat oven to 350 degrees Fahrenheit. Meanwhile, start with the apples. Cut the apples into quarters and de-core them (remove seeds and ends, no need to peel the skin). Using a mandoline, thinly slice 2-3 apples (depending on the size of your ham). Reserve these slices to be inserted between the slices of the ham. For the remaining apples, use the thicker setting on the mandoline. These slices will go on the bottom of the baking dish.