Venetian Sauce. No. 1. For Fish Fillets. (Mrs. Sherwood.)
Draw down the bones of the fish to minutes in a little second stock or water, with a sprig of parsley. With 1 oz. of butter and a teaspoonful of flour make a white roux while the roux is cooked enough, strain the fish liquor into it; put it aside.
Strain the yolk of 1 egg and mix into it very gradually 4 table-spoonfuls of well-warmed cream, and keep on one side.
Next boil up the mixed roux and fish liquor and skim it thoroughly; when off the boil add the yolk and cream, a little salt, and a squeeze of lemon-juice.