1. Place sweet potato in a small saucepan; cover with water. Bring to a boil. Reduce heat; cover and simmer for 30-40 minutes or just until tender. Drain.
2. When cool enough to handle, peel and cut into 1/4-in. slices. Place in a greased shallow 2-cup baking dish.
3. In a small bowl, combine the brown sugar, pecans, pineapple juice, lemon juice and cinnamon; sprinkle over sweet potato slices. Dot with butter.
4. Bake, uncovered, at 350° for 15 minutes or until bubbly and heated through. Yield: 2 servings.