For the filling
• 4 chicken fillets trimmed and diced into chunks
• 1 leek cut then placed in a bowl of cold water to rinse
• 1 carrot topped and tailed and sliced thinly
For the pastry
• 250g plain flour
• 125g butter
• 2 tablespoons cold water
(see tutorial on making pastry)
For the sauce
• 1 tablespoon butter
• 2 tablespoons flour
• 200ml milk
• 250ml stock