Put a piece of halibut weighing two pounds in a saucepan, and cover it with fresh water ; add one sliced onion, half a sliced carrot, and a bouquet (No. 254). Season with a handful of salt and two tablespoonfuls of vinegar. Put on the lid and let cook gently, but no more than five minutes after boiling-point ; then lift up the fish alone, drain well ; dress it on a hot dish, and serve with any desired sauce.