Sweet and Sour Sauce I

¾ cup white sugar

⅓ cup white vinegar

⅔ cup water

¼ cup soy sauce

1 tablespoon ketchup

2 tablespoons cornstarch

Place the sugar, vinegar, water, soy sauce, ketchup and cornstarch in a medium saucepan, and bring to a boil. Stir continuously until the mixture has thickened.