This is a recipe that my Aunt Jill got when she took Chinese cooking classes after she and my grandmother went to China to pick up an Uncle of mine who was serving an LDS mission there. This has always been what sweet and Sour Sauce tastes like to me. I hope you enjoy it as well.
1 C Water
2 Tbsp Ketchup
1 tsp Sugar
1 tsp Red wine Vinegar
place ingredients into pan and bring to a boil. Add cornstarch to thicken mixture. Pour over your desired ingredients or use as dipping sauce or marinade.