6 spears purple sprouting broccoli
200g/7oz chestnut mushrooms
2 garlic cloves, sliced
1 garlic clove
½ black garlic bulb
1 rosemary sprig, needles picked and chopped
½ bunch tarragon, chopped, plus 2 sprigs, leaves picked, to serve
200ml/7fl oz chicken stock
2 tbsp olive oil
1 tbsp olive oil
100ml/3½fl oz double cream
2 x 200g/7oz fillet steak