Beef pie

Ingredients

• 2 tbsp olive oil
• 900g (2lb) stewing beef, cut into 2cm (¾in) cubes
• Salt and freshly ground black pepper
• 2 tbsp plain flour
• 2 onions, peeled and finely chopped
• 2 carrots, peeled and finely chopped
• 2 sticks of celery, trimmed and finely chopped
• 2 large leeks, trimmed and cut into 3cm (1¼in) lengths
• 4 cloves of garlic, peeled and finely sliced
• 2 tbsp tomato paste
• 200ml (2fl oz) red wine
• 2 tbsp red wine vinegar
• 2 strips of orange peel
• 1 bay leaf
• 2 sprigs of rosemary
• 200g (7oz) ready-rolled
• puff pastry
• 1 egg, beaten