INGREDIENTS
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2 large croissants cut into small pieces (about 3 cups)
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1/4 cup plus 2 tablespoons sugar
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2 tablespoons cornstarch
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1 1/4 cups whole milk
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2 egg yolks
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1 tablespoon lemon zest
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pinch of salt
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1/4 cup lemon juice
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1/2 cup fresh blueberries
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1 tablespoon butter