Apple Sweet Potato Bake

3 cups sliced peeled cooked sweet potatoes
3 cups sliced peeled tart apples
3/4 cup packed brown sugar
3/4 teaspoon ground nutmeg
1/4 teaspoon ground allspice
1/4 teaspoon salt
1 dash pepper
3 tablespoons butter or margarine

In a greased 1-1/2-qt. baking dish, layer half of the sweet potatoes and apples. Combine brown sugar, nutmeg, allspice, salt and pepper; sprinkle half over apples. Dot with half of the butter. Repeat layers. Cover and bake at 350 for 15 minutes. Baste with pan juices. Bake, uncovered, 15 minutes longer or until the apples are tender.