Clean the leeks and chop into medium sized pieces. Remove the rind of the bacon and chop into small to medium sized pieces. Cut the chicken breast into small to medium sized pieces too. Preheat the oven to 190C/Gas 5. In a frying pan melt the margarine and gently fry the bacon and the leeks together, making sure that the leeks do not burn. When the bacon is cooked through, add the chicken and continue frying, stirring continuously, until the chicken is browned all over. Reduce the heat to a very low flame and add the flour, mixing the mixture well. Gradually add the Pinto’s Pride Chicken Spoon Stock whilst stirring. Season to taste. Give the mixture one last stir and remove from the heat and allow to cool completely.
In the meantime grease, a round oven-proof dish of diameter 23cm, with a little bit of oil and dust it with flour or more conveniently use baking paper to line the dish. If using baking paper, lightly wet the paper and squeeze off any excess water, before placing it on the dish so that it remains in place.
Lightly dust your kitchen top with flour and roll out half of the pastry in a circular shape. Line the bottom of your oven dish with the pastry. Fill the pastry with the cold chicken mixture.
Roll out the second half of your pastry and place over the pie filling. Gently press the top pastry to the bottom pastry with the end of a fork to seal your pie. Trim off any excess pastry on the outside of your oven dish. Baste the pastry with the beaten egg and sprinkle the pastry with sesame seeds (if using). Prick the top of the pastry with the fork so that any excess steam can escape from inside the pie, allowing the pastry to crisp up. Bake in the oven for around 30-40 minutes or until you see that the top of the pastry has turned golden all over. Allow to cool before removing the pastry from the dish. Serve with vegetables or salad.
Note: you may add 200g chopped mushrooms to the chicken mixture if you like.