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Chicken pie recipe: Ingredients 1 1.6kg (3½lb) whole chicken 1 onion, halved 1 large carrot, peeled 1 stick of celery, sliced Few sprigs of parsley 25g (1oz) of butter 3tbsp plain flour 250g (8oz) baby button mushrooms, halved 3tbsp chopped fresh parsley 1 (300g) pack ready-made puff pastry 1 egg, beaten Salt and freshly ground black pepper