All videos and photos by Daniel Peiken at www.AthensRockShow.com. Homes and Real Estate in Georgia and America at www.AthensHome.com. Video Rating: 0 / 5 Question by Alice: What is the function of soy sauce? What does it actually do in a recipe such as sweet and sour sauce? Any help would be greatly appreciated. Thanks. Best answer: Answer by GinaIt’s quite salty and has quite a plain taste. If you use soy sauce, make sure you have other types of sauces or flavours in your recipe. Know better? Leave your own answer in the comments!