In a saucepan, combine blueberries and sugar; bring to a boil.
Meanwhile, in another small bowl combine cornstarch and cold water; whisk until smooth.
Add cornstarch mixture and lemon juice to blueberries and whisk to combine.
Boil and continue boiling 3 to 5 minutes or until sauce is as thick as you like.
Set aside to cool. Sauce will thicken as it cools.
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