Chicken & leek pie - Master recipes

Ingredients

• 1 ½kg whole corn-fed chicken -
• ½ tsp peppercorns -
• 2 bay leaves -
• 3-4 thyme sprigs -
• 1 onion, halved -
• 1 celery stick -
• 4 large or medium eggs -
• 25g butter -
• 2 tbsp olive oil -
• 6 bacon rashers, cut into large pieces -
• 2 leeks, thinly sliced -
• 2 tbsp plain flour thinly sliced -
• 2 tbsp grainy mustard -
• 4 tbsp crème fraîche -
• 4 tbsp chopped fresh parsley -
• squeeze of lemon juice -
• 250g bought puff pastry or home-made rough puff -
• beaten egg, for glazing -