Sausage, apple and leek pie - Southern Co-op

Ingredients

• 225g plain flour
• 100g butter, cold and diced
• ½ tbsp olive oil
• 6 pork sausages
• 2 leeks, sliced
• 1 tsp dried thyme
• 1 apple, peeled and sliced
• 1 tbsp plain flour
• 1 tbsp grainy mustard
• 100ml apple juice
• 200ml chicken or vegetable stock
• Beaten egg or milk, for brushing