INGREDIENTS
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40g butter
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2 tablespoons plain (all-purpose) flour
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⅔ cups (160ml) chicken stock
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1 ¼ cup (310ml) milk
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1 quantity corned beef+
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1 cup (120g) frozen peas
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2 tablespoons chopped flat-leaf parsley leaves
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1 sheet store-bought puff pastry
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1 egg, lightly beaten