Kid-Approved Sweet and Sour Chicken Sauce

Stir reserved pineapple juice vinegar sugar and ketchup in a saucepan over medium heat until blended 2 to 3 minutes.

Whisk cornstarch and water in a bowl until cornstarch is dissolved; stir into pineapple juice mixture.

Stir pineapple and carrots into the sauce; bring to a boil reduce heat to medium-low and cook at a simmer until the sauce thickens about 5 minutes.