Yam and Apple Casserole

4-5 medium yams (cut, parboil - leave just a little firm)
4-5 apples, peeled and sliced
4 tbsp cornstarch
1 c sugar (1/2 brown, 1/2 white)
2 c water
1 tsp salt
1/2 c butter
1 tsp cinnamon

Mix cornstarch, sugar, water and salt in a small saucepan. Bring to a boil. Stir in butter and cinnamon. Arrange yams and applies in layers and pour sauce over top (I do 2 layers, sauce, 2 layers, sauce). Bake at 350 for one hour.