Fish sauce is a typical sauce in Southeast Asia, especially in Thailand. It is made from fermenting seafood, mostly from anchovies. Spice Up! Fish Sauce gives an authentic flavour to all kinds dishes. The secret behind the Thai curry dishes is fish sauce. It's an ingredient that gives you a little bit of everything when thrown into marinades, stir fries, and salad dressings, and it's just as useful in non-Asian cooking too. A little fish sauce can boost salty, savory flavor in sautéed greens, pastas, roast chicken, or broths.