1 large head cauliflower, cut into florets
2 tsp Dijon mustard
20²µ/¾´Ç³ú plain flour
sea salt and freshly ground black pepper
6-8 rasps freshly grated nutmeg (see recipe tip)
20²µ/¾´Ç³ú unsalted butter
40g/1½oz mature cheddar, finely grated
250ml/9fl oz skimmed milk
15²µ/½´Ç³ú Parmesan, or similar vegetarian hard cheese, finely grated