Season cod fillets with half of the
salt and 1/2 teaspoon pepper.
In a skillet, cook 3 strips of
bacon until lightly browned. Add half of the chopped mushrooms,
chopped onion, and chopped celery; cook until tender.
Stir in the cooked rice.
Place the fish in a greased
baking pan; top with the rice. Drizzle with 2 tablespoons melted
Cover and bake at 350 degrees
until the fish flakes easily, about 10 minutes.
Meanwhile, in a saucepan, melt
remaining margarine. Add 1 tablespoon chopped onion and
remaining sliced mushrooms. Cook until tender, then stir in
flour, dry mustard, salt, and thyme. Gradually stir in half and
half. Cook over medium heat until thickened, stirring
constantly. Stir in toasted walnuts.
Serve over the fish and rice