250g/9oz cavolo nero, stalks removed, thickly sliced
6 garlic cloves, 2 lightly crushed, 4 finely chopped
150g/5陆oz chestnut or button mushrooms, finely sliced
2 tbsp roughly chopped fresh flatleaf parsley
400g/14oz potatoes, peeled and cut into 1.5cm/陆in dice
2 shallots, finely chopped
3-4 sprigs thyme, leaves only
500ml/18fl oz beef stock
sea salt and freshly ground black pepper
1 tbsp vegetable oil
75驳/2戮辞锄 butter
4 x 250g/9oz sirloin steaks, at room temperature
200ml/7fl oz red wine