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Bring water to a boil in a saucepan, dissolve in sugar and shortening.
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Bring beans and bean liquid to a boil in a saucepan or large skillet.
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Add water-shortening-sugar mixture.
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Boil vigorously and mash for 15 minutes or until a paste begins to come together.
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Dissolve cornstarch in a little water and stir in to aid the formation of the paste.
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Refrigerate before use to improve consistency. For coarser paste, leave some beans whole. Use more shortening, less water, and/or a food processor for a smoother texture.