Apple Yam Casserole

2 large yams
4 big apples
 Pre cook yams and cut into bite size pieces.  Peel and cut apples.  Alternate layers of apples and yams in a buttered 4 qt. casserole dish.

Sauce:
1 C sugar
1/4 C cornstarch
1 tsp salt
Mix well. Add 2 C very hot water and bring boil until thick and clear.  Take off heat and add 1/2 C butter or margarine.  Stir until melted.  Pour over the apples and yams.

Bake at 350 for 1 hour.