2 carrots, chopped
1 stick celery, chopped
1 onion, chopped
1 tsp fresh parsley
500g/1lb 1陆oz potatoes, boiled
1 tsp chopped fresh thyme
salt and freshly ground black pepper
2 tbsp vegetable oil
150g/5oz butter
100ml/3陆fl oz milk
1kg/2lb 3oz mutton or lamb mince
1 lamb stock cube