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
Chaudfroid sauce Madeira wine, which is cooked and reduced to a sauce consistency. Some simpler preparations of chaudfroid sauce omit the use of meat, and these can be prepared as a brown sauce, a white sauce and as a red sauce using tomato purée. A simpler preparation of chaudfroid sauce without the use of meat can be made by using espagnole sauce, adding ingredients such as aspic jelly, gelatin, cream and sherry to it, and cooking the mixture. Another simpler preparation technique that lacks meat involves the use of allemande sauce or velouté sauce and other ingredients. A sweet version of chaudfroid