method
1. Cook the potatoes in lightly salted, boiling water for 12-15 minutes until tender, Cook the broccoli in lightly salted, boiling water for 5 minutes. Drain the potatoes and broccoli thoroughly.
2. Meanwhile, melt the margarine in a small saucepan and stir in the flour and mustard powder Cook, stirring, for 30 seconds. Gradually add the milk and cook, stirring, until you have a smooth, thickened sauce. Reduce the heat to very low and stir the cheese into the sauce. Simmer very gently for 5 minutes, stirring from time to time. Season to taste.
3. Mix the potatoes and broccoli with the cheese sauce, and spoon the mixture into a flameproof dish. Mix together the breadcrumbs and oil, and scatter over the top. grill/broil under a medium heat for 3-5 minutes until the topping is golden and crispy.
serving amount
serves 4
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