BBC Food - Recipes - Cottage pie with peas

Ingredients

• 1.5kg/3lb 4oz baking potatoes
• 75g/3oz butter
• 150ml/5fl oz milk
• Salt and freshly ground black pepper
• 400ml/14fl oz beef stock
• 200ml/7fl oz red wine
• 75ml/3fl oz balsamic vinegar
• 1 tbsp olive oil
• 1 onion , peeled, finely chopped
• 2 carrots , peeled, finely chopped
• 750g/1lb 11oz beef mince
• 1 tbsp plain flour
• 1 bay leaf
• 150g/5oz b oil ed peas, to serve