Danish Bleu Lobster Casserole

3 tablespoons butter
1 pound raw lobster meat, cut into bite-size pieces
3 tablespoons all-purpose flour
3/4 teaspoon dry mustard
Salt and pepper to taste
1 cup heavy cream
1/2 cup milk
3 slices bread, crust removed
1/2 cup Danish blue cheese, crumbled

Preheat oven to 350 degrees F. Lightly grease a 2-quart baking dish.

Melt butter in a medium size pot over low heat. Slowly saut