Brush fish with 1 tablespoon lemon juice; sprinkle with salt and 1/4 teaspoon paprika. Arrange in a lightly greased baking dish. Bake at 350°F for 25 minutes or until fish flakes easily when tested with a fork. Meanwhile, saute mushrooms in margarine in a skillet until tender. Sprinkle flour over mushrooms; stir and cook 1 minute. Gradually whisk in milk, stirring constantly. Stir in artichoke hearts. Cook, stirring constantly, until thickened. Add lemon juice and salt. Arrange steaks on a platter and top with sauce. Sprinkle with paprika.
