Steam the sweet potato cubes until they can be pierced easily with a fork, but not mushy. While they are steaming, chop up apples into small cubes (leaving the skin on.) After the potatoes have cooled, mix them in to the apples. In a separate bowl, mix the apple cider, maple syrup and cinnamon.
Pour the cider mixture over the apples and sweet potatoes. Sprinkle on the raisins and walnuts and stir. Let it chill in the fridge for a few minutes and top with granola of your choice when ready to serve.
Feel free to experiment when the portions and the ingredients according to what you have around the house!