Cheddar Cheese Cauliflower Gratin

1 large cauliflower
1 1/3 cup milk
0.49 lb Mature cheddar cheese, finely grated
3 tablespoons plain flour
0.11 lb butter
0.06 lb fresh breadcrumbs (optional)
1/2 teaspoon dried English mustard (Colman's)
nutmeg
salt and black pepper

1. *If oven baking, pre-heat oven to 225C or 450F.
2. Trim the cauliflower & break into small florets.
3. Boil in salted water for 10-15 minutes or until just tender.
4. Drain in a colander and then place in a buttered ovenproof baking dish.
5. Add the milk, flour and butter to a saucepan.
6. Heat and whisking with a wire whisk continuously until the sauce thickens, boils and is smooth.
7. Allow to simmer for a further 2 minutes.
8. Add three-quarters of the grated cheese, mustard, a pinch of nutmeg and seasoning.
9. Cook for further minute stirring well.
10. Pour the sauce over the cauliflower.
11. Mix the remaining cheese, and breadcrumbs, if using, together, sprinkle over the top.
12. Place under a hot grill until golden brown, OR, bake in a pre-heated oven 450F for
about 15 to 25 minutes until golden brown and bubbling.
13. Serve immediately.