Core large red apples and cut crosswise into two halves. Allow 1/2 for each person. Place in shallow baking pan, cut side up. Cover cut side of apples with brown sugar and bake slowly until tender. Have ready well seasoned and smoothly mashed sweet potato. Pile on top of each apple half, swirling potato into attractive peaks. Cover with melted butter and place in hot oven, just long enough to reheat and brown lightly.