The original sweet and sour sauce recipe consists of sugar and rice vinegar. We use this sauce for meats, fish, and vegetables, and it's not the same as plum sauce. As the name suggests, you get the sweet and sour flavor from this sauce, perfect for egg rolls or spring rolls, too! Plum sauce isn't as sweet and tart as sweet and sour sauce. These are two different ingredients, but you can still use them as substitutes for one another by mixing the right ingredients.