Minced Beef, Potato & Onion Pie

Ingredients

• 400g plain flour
• good pinch of salt
• 200g butter, chilled, cubed
• 3-5 tbsp cold water
• egg, beaten with a dash of milk, to glaze
• 1 tbsp olive oil
• 1 large onion, finely chopped
• 1 clove of garlic, crushed
• 750g good quality minced beef steak
• 2 tbsp plain flour
• 400ml beef stock
• 2 tbsp tomato puree
• 1 tbsp HP brown sauce
• 1 tbsp of Worcestershire sauce
• 2 large potatoes, peeled and cubed
• 1 tbsp finely chopped fresh parsley
• Salt and freshly ground black pepper