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In a saucepan over medium heat, combine blueberries, 1/4 cup water, orange juice, and sugar; stir gently.
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Bring to a boil.
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In a small bowl, mix cornstarch and 1/4 cup cold water.
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Gently stir into the blueberry mixture, so as not to mash the blueberries.
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Simmer gently until thick enough to coat the back of a metal spoon; 3-4 minutes.
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Remove from heat, and stir in extract and cinnamon.
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Sauce can be thinned with water if too thick.