1 large head cauliflower, cut into florets
2 tsp Dijon mustard
20驳/戮辞锄 plain flour
sea salt and freshly ground black pepper
6-8 rasps freshly grated nutmeg (see recipe tip)
20驳/戮辞锄 unsalted butter
40g/1陆oz mature cheddar, finely grated
250ml/9fl oz skimmed milk
15驳/陆辞锄 Parmesan, or similar vegetarian hard cheese, finely grated