Mary Berry’s chicken pot pie recipe

Ingredients

• 1 kg chicken
• 1.2 l chicken stock
• 1 onion, quartered
• 1 celery stalk, thickly sliced
• 1 lemon, juice and zest only
• 2 carrots
• 2 waxy potatoes, peeled and cut into quarters
• 45 g butter
• 45 g plain (all-purpose) flour, plus extra for dusting
• 125 g frozen peas
• 175 g shortcrust pastry
• 1 beaten egg yolk, for glazing
• 1 pinch salt and black pepper