3 sweet potatoes, peeled and cubed
2 Granny Smith apples – peeled, cored and sliced
1/2 cup packed brown sugar
1/2 cup water
1/4 teaspoon ground cinnamon
1/2 cup raisins
2 tablespoons butter
1/4 teaspoon salt
3 tablespoons all-purpose flour
3 slices lemon, thinly sliced