Gruyere and mustard cauliflower cheese

1 large cauliflower
30g butter
30g plain flour
pinch mustard powder
150 ml milk
150 ml single cream
60g blue cheese
1/2 bunch chives, chopped
pinch cayenne pepper
large handful breadcrumbs
30g Gruyere, grated
pinch mutmeg

1. Heat oven to 200, GM6
2. Put cauliflower in roasting dish
3. Drizzle with olive oil
4. Cover with foil
5. Put in oven while it is heating up, for 30 mins
6. Make sauce
   
   • Melt butter
   • Add flour - cook for 1 min
   • Add mustard and cayenne
   • Gradually stir in milk and cream
   • Simmer until sauce thickens
   • Remove from heat
   • Add blue cheese and chives
7. Pour sauce over cauliflower
8. Season with pepper
9. Sprinkle over breadcrumbs and Gruyere
10. Sprinkle over nutmeg
11. Bake for 20 mins