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
Fish ball cuttlefish balls (墨魚丸). Readily available in traditional markets and supermarkets, fish balls are also a popular ingredient for hot pot. White fish balls from traditional fish ball restaurants are made from fresh fish and are normally hand-made (手打) by the owners using traditional techniques. The big golden fish ball is a snack in Cheung Chau. Distinguishing features include size, sauce and texture. They can be fist-sized and are served with a special curry sauce, and are mainly made from fresh fish which makes the texture more smooth. The basic ingredients are fish, flour and flavourings such as salt and sugar,