Flounder with butter

1/4 cup olive oil 1/3 cup butter , can use margarine 2 lbs sole, can use flounder 1 (16 ounce) can tomato sauce 2 tablespoons parsley , chopped 1 teaspoon[...]

4 celery ribs , chopped fine 2 teaspoons onions , minced 3 tablespoons butter or 3 tablespoons margarine 2 teaspoons dill (or to taste) 1/2 teaspoon tarragon[...]