200g/7oz butternut squash, peeled and cut into 1cm/陆in cubes
1 onion, roughly chopped
陆 tsp dried sage
2 handfuls spinach leaves
150驳/5陆辞锄 risotto rice
freshly ground black pepper
500ml/18fl oz vegetable stock
2 tbsp freshly grated Parmesan (or a vegetarian hard cheese alternative)