5 celery sticks, chopped
200g/7oz small chestnut mushrooms, sliced
2 garlic cloves, crushed
2 onions, finely chopped
2 tbsp chopped sage, plus extra to garnish
275g/10oz risotto rice
salt and freshly ground black pepper
2 tbsp olive or sunflower oil
750ml/1陆 pints hot vegetable stock
knob of butter
115g/4oz blue cheese (such as stilton or dolcelatte), coarsely grated
150g/5陆oz frozen petits pois
250ml/9fl oz white wine