Sweet and sour sauce is a popular sauce among American Chinese foods. Most of time it use as a dipping sauce like deep fried wanton wrappers. And, other deep fried dish such as sweet and sour pork or chicken dish.
Pour 1 cup of pineapple juice and 3/4 cup of brown sugar into a pot. Then, turn on low fire.
After that, add 2 tablespoons soy sauce, vinegar 2 tablespoons, ketchup 3 tablespoons, salt 1/4 teaspoon and mix them well. Let it simmer for a few minutes until the sugar is melted.
In a small container, add 3 tablespoons of corn starch, 2 tablespoons of water and mix it well. Next, add corn starch mixture to thicken the sauce.