Cook
the
cabbage in a saucepan of salted boiling water for 5 minutes. Drain
well and set aside.
Melt
the butter in a saucepan, stir in the flour and
mustard, and cook for 2-3 minutes. Gradually add the
milk, stirring constantly until the sauce boils and
thickens.
Stir in the cabbage and cream, and add
salt and pepper to taste.
Transfer the mixture to a baking dish.
Mix the
cheese and bread crumbs together and sprinkle the
mixture over the cabbage cream.
Bake in a preheated
oven,
180°C
(350°F), Gas Mark 4, for 30 minutes. Serve
immediately.