Slice and fry the onions of a nice brown colour, and put them into a stewpan with the Espagnole, ketchup, wine, and a little liquor in which the fish has been boiled. Add the seasoning, herbs, and spices, and simmer gently for 10 minutes, stirring well the whole time; strain it through a fine hair sieve, put in the lemon-juice and anchovy sauce, and pour it over the fish. This sauce may be very much enriched by adding a few small quenelles, or forcemeat balls made of fish, and also glazed onions or mushrooms. These, however, should not be added to the matelote till it is dished.
Time: 10 minutes.
Seasonable at any time.
Note: This sauce originally took its name as being similar to that which the French sailor (matelot) employed as a relish to the fish he caught and ate. In some cases, cider and perry were substituted for the wine. The Norman matelotes were very celebrated.