Sweet Potato - Apple Casserole

This is a family favorite.

Sweet Potato – Apple Casserole

5 sweet potatoes or yams
5 cooking apples
1 cup sugar
3 Tbsp. cornstarch
2 cups water
1/2 cup butter or margarine, in chunks
2 Tbsp lemon juice
1 tsp salt

Boil sweet potatoes 20 minutes. Cool. Skin and slice in ¼ - ½ inch slices. Peel, core and slice apples. In a buttered 9 x 13 casserole. Alternately layer sweet potatoes and apples on their sides ending with sweet potatoes. Combine sugar and cornstarch in a saucepan. Mix in water, butter, lemon juice and salt. Stir and bring to a boil for 1 minute. Pour over casserole. Bake at 375 for 1 hour.