Fish sauce is often made from anchovies, salt, and water, and is intensely flavoured. Anchovies and salt are arranged in wooden barrels to ferment and are slowly pressed, yielding the salty, fishy liquid. The salt extracts the liquid via osmosis. Southeast Asians generally use fish sauce as a cooking sauce. However, there is a sweet and sour version of this sauce which is used more commonly as a dipping sauce (see "nước chấm"). Fish sauce in Burma is called "ngan bya yay" (ငံပြာရည်). In Cambodia, fish sauce is known as "teuk trei" (ទឹកត្រី), of which there are a variety of sauces using
Worcestershire sauce including traditional Welsh rarebit, Caesar salad, Oysters Kirkpatrick, and deviled eggs. As both a background flavour and a source of umami (the savoury "fifth flavour"), it is also now added to dishes which historically did not contain it, such as chili con carne and beef stew. It is also used directly as a condiment on steaks, hamburgers, and other finished dishes. The sauce is also used to flavour cocktails such as the Bloody Mary and Caesar. A fermented fish sauce called "garum" was a staple of Greco-Roman cuisine and of the Mediterranean economy of the Roman Empire, as the first-century