Chicken & ham pie - Good Food Middle East

Ingredients

• 6 boneless skinless chicken breasts, cubed
• 3 carrots, chopped
• 3 potatoes, peeled and cubed
• 2 celery stalks, chopped
• 2 tsp chopped fresh thyme or 1 tsp dried
• 850ml hot chicken stock
• 50g butter
• 2 onions, chopped
• 50g plain flour
• 300ml milk
• juice of 1 lemon
• 2 tbsp chopped parsley
• 4 thin slices ham, cut into strips
• 500g pack shortcrust pastry
• 1 egg, beaten