flour in the melted butter, trickle, stirring, the hot fish
bouillon into it. Boil for 40Ч50 minutes and strain. Separately
heat the chopped onion and parsley in a little butter without
letting their colour change. Join the ingredients, salt and
pepper the sauce, sprinkle it with the lemon juice, simmer for
5Ч7 minutes, and serve with boiled fish. You can add chopped
eggs and parsley to the sauce.