Apple Yam Casserole

This recipe is from Dub. A lot of us in our family don't particularly like sweet potatoes or yams, but Dub has been making this recipe for a few years now. I kind of like it myself and have developed a taste for some sweet potato dishes.

Apple Yam Casserole (from Dub adapted from Allrecipes.com)

Ingredients

2 sweet potatoes or yams (the orange ones -- NOT the yellow ones)
2 Granny Smith apples - peeled, cored and sliced
1/2 cup packed brown sugar
1/3 cup water + 1/4 cup water
1/4 teaspoon ground cinnamon
1/2 cup raisins
2 tablespoons butter
1/4 teaspoon salt
2 tablespoons all-purpose flour (or 1 tablespoon corn starch)
3 slices lemon, thinly sliced

Directions

1. Boil sweet potatoes in water in large saucepan for 30 minutes. Peel and cube.
2. Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 2 quart casserole dish.
3. In the casserole dish, alternately layer the sweet potatoes and apples.
4. In a medium saucepan over medium heat, mix together brown sugar, 1/3 cup water, cinnamon, raisins, butter and salt. Cook 5 minutes.
5. In a small bowl, stir together remaining water and flour or corn starch. Combine with the brown sugar mixture. Pick out any lumps that may have formed, heh heh. Pour sauce over the sweet potatoes and apples. Place the lemon slices on top.
6. Bake covered in the preheated oven 20 minutes. Uncover and continue baking 20 minutes, or until the sweet potatoes and apples are tender.