1 large cauliflower, cut into florets
1 tsp English mustard
50g/2oz plain flour
splash of Worcestershire sauce
salt and black pepper
50g/2oz butter, plus extra for greasing
125驳/4陆辞锄 cheddar cheese, grated
2 free-range egg yolks
75g/3oz emmental cheese, grated
450ml/16fl oz milk
150g/5oz cooked flaked salmon