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Place sweet potatoes in a large kettle and add water to cover.
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Cook over medium heat until barely tender; drain.
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Peel and cut potatoes into fourths.
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Arrange in a medium size casserole.
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Preheat oven to 350°F.
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While potatoes are cooking, combine sugars, ginger and cornstarch in a small saucepan.
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Add pineapple juice and lemon juice.
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Stir over medium heat until sugars are dissolved and mixture starts to bubble; stir in butter.
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Pour sauce over potatoes.
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Bake uncovered 50 to 60 min or until sauce is thickened.