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Bring the pineapple juice to a boil in a small saucepan and reduce until it measures 1/4 of a cup; once reduced, cool and reserve.
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Combine the milk, sugar and salt in a medium saucepan over medium heat and bring up to a simmer, stirring occasionally.
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Dissolve the cornstarch into the cooled pineapple juice, whisk to make sure there are no lumps and then whisk into the simmering milk mixture.
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Continue to simmer and stir until the mixture begins to thicken, about 10 minutes.
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Add some of the milk mixture to the egg yolks, mix and then add the egg yolks to the pot, stirring all the while.
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Raise the heat, bring the mixture to a boil, stirring constantly, until the mixture is very thick and puddinglike.
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Remove immediately from the heat and pour into a dessert bowl. Refrigerate at least four hours or overnight.
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Dust with nutmeg before serving.