Fish sauce are made with anchovies, mackerel, scabbard fish and salt. The bigger the fish, the more mercury you might expect, especially if predator fish like scabbard fish. They do not have any additives like sugar, hydrolyzed protein, or preservatives. Vietnamese prefer sauces without a strong smell, and transparent with a deep golden amber color. "First press" fish sauce, meaning the sauce is bottled from the first time the fermenting barrels are drained, also indicates quality. Lastly, when measuring the nitrogen level of fish sauces (N), most fish sauce on the market falls within the mid 20N range. Anything over 30N is
Genovese sauce nor with Salsa Genovese, a red wine and vegetable condiment for fish, nor with the "sauce génevoise" from Lake Geneva, again served with fish. Genovese sauce is prepared by sautéing either beef, veal or pork in a large number of onions, for at least two but as many as ten hours. The onions are typically accompanied by minced carrots and celery in what is sometimes known as a "mirepoix," and the sauce may be additionally seasoned using garlic, marjoram, and either bacon, prosciutto or lard. The slow cooking of the onions is especially important for the sauce's flavor, and is