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
Worcestershire sauce October 1897, Lea & Perrins relocated manufacturing of the sauce from their pharmacy to a factory in the city of Worcester on Midland Road, where it is still made. The factory produces ready-mixed bottles for domestic distribution and a concentrate for bottling abroad. In 1930, the Lea & Perrins operation was purchased by HP Foods, which was in turn acquired by the Imperial Tobacco Company in 1967. HP was sold to Danone in 1988 and then to Heinz in 2005. Due to a shortage during World War II, Lea and Perrins switched from using soy sauce to hydrolyzed vegetable protein.