Preheat the oven to 375 degrees. Lightly grease a large baking sheet, and arrange the sweet potato slices into a single layer on the pan. Transfer to the oven, and bake for 15-20 minutes or until sweet potatoes are softened. Remove from oven. Turn the oven to 350 degrees.
In a small bowl, mix together coconut sugar, cinnamon, pecans, ghee, and salt.
Now prepare the casserole. Lightly grease a 9x13 inch casserole dish. Arrange a layer of sweet potatoes on the bottom, then top with a layer of apples. Spoon or spread some of the sugar/pecan mixture over the apples. Repeat for another layer. End with a layer of sweet potatoes on top. Spoon the last of the mixture on top. Finally, top with apple juice or cider.
Cover and transfer the casserole dish to the oven. Bake for 30 minutes, remove the lid, and bake for another 10-15 minutes.
*You can replace ghee with coconut oil for a Vegan recipe