1

Cook the cauliflower in a covered saucepan with a small amount of boiling, lightly salted water until just tender - about 10 minutes.

2

Meanwhile, make an all-in-one cheese sauce by putting the milk, flour and margarine into a saucepan. Bring up to the boil, stirring constantly with a wire whisk, until the sauce blends and thickens. Reduce the heat to low and cook gently, stirring all the time, for another 30 seconds or so.

3

Add the cheddar and mustard to the sauce and cook gently for about 30 seconds, stirring, until the cheese has melted. Season to taste.

4

Preheat the grill. Drain the cauliflower thoroughly, place in a warmed ovenproof serving dish, then pour over the sauce. Sprinkle with Italian-style hard cheese, then grill until lightly browned. Serve at once, sprinkled with fresh chives.