Cottage pie

INGREDIENTS

• 3 tbsp olive oil
• 1¼kg beef mince
• 2 onions , finely chopped
• 3 carrots , chopped
• 3 celery sticks, chopped
• 2 garlic cloves , finely chopped
• 3 tbsp plain flour
• 1 tbsp tomato purée
• large glass red wine (optional)
• 850ml beef stock
• 4 tbsp Worcestershire sauce
• few thyme sprigs
• 2 bay leaves
• 1.8kg potatoes , chopped
• 225ml milk
• 25g butter
• 200g strong cheddar , grated
• freshly grated nutmeg