BROILED MACKEREL WITH NORMANDY SAUCE

Soak cleaned mackerel in oil with chopped onion and parsley to season. Leave the roe inside. Rub the inside with lemon-juice and butter, wrap in oiled paper, and broil over a slow fire for forty minutes. Prepare a Cream Sauce and add to it two tablespoonfuls each of mushroom catsup and fish stock, or boiling water in which a little anchovy paste has been dissolved. Bring to the boil, take from the fire, add the yolks of two eggs and the juice of half a lemon. Add one tablespoonful of butter, pour over the fish, and serve.