In your trusty saucepan, get the sugar, vinegar, ketchup, and soy sauce all chummy.
Fire it up to medium and keep stirring. Sugar can be clingy; make sure it’s all dissolved.
When things start to bubble, toss in the garlic powder and that pinch of salt.
Meanwhile, in a different bowl, get the cornstarch and water all mixed up, no lumps allowed.
Pour it into the saucepan, stirring like you’ve got a rhythm going.
About 5 minutes in, or when it feels just right and thick, kill the heat. Let it chill before serving or tucking it away.