The Hairy Bikers' superb steak and ale pie recipe

Ingredients

• 500 g home-made or ready-made puff pastry
• 5 tbsp sunflower oil
• 200 g smoked streaky bacon rashers, cut into 1cm/0.5inch strips
• 2 medium onions, sliced
• 2 garlic cloves, finely chopped
• 850 g well-marbled braising steak, trimmed of hard fat or gristle
• 500 ml bottle of real ale
• 500 ml good-quality beef stock
• 1 tbsp tomato purée
• 4 sprigs of thyme, leaves stripped from stalks
• 2 bay leaves
• 2 tbsp cornflour, blended with 2 tbsp cold water
• 250 g small chestnut mushrooms, wiped and halved or quartered if large
• 1 pinch flaked sea salt
• 1 pinch freshly ground black pepper