Wash the blueberries and set aside. Split the vanilla bean lengthwise and scrape out the seeds.
In a saucepan, gently heat the milk over low heat with the vanilla bean seeds and the pod. Do not boil.
In a bowl, whisk together the egg yolks, sugar, and cornstarch. Slowly pour in the warm vanilla milk, whisking constantly to combine.
Pour the mixture back into the saucepan and cook over low heat, stirring constantly, until the sauce thickens.
Add the grated lemon zest and the blueberries, then cook for an additional 2-3 minutes, or until the blueberries soften and begin to burst.
Strain the sauce for a smoother consistency, if desired, or leave it chunky. Serve warm over cakes, ice cream, or pancakes.
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