Method                                                                           *(Ref. oven manual)
1. Cook the macaroni, cover and leave to stand.
2. Put the butter and milk in a medium bowl. Heat for 2(1 ½) minutes. Add the
    flour and mustard and whisk well.Cook for 2(1½ ) minutes, whisking once, until the sauce boils
    and add the cheese, stirring until it has melted.
3. Thoroughly drain the macaroni and tip into a shallow casserole. Stir in the cheese sauce and
    sprinkle crisp crumbs over the top.
4. Cook on 70% for 5(4)*minutes.