This is actually my Mom's recipe, but my family really enjoys it!
1-2 pounds of chicken( I use skinless/boneless)
Cook through and then cut up into bite size pieces.
1 cup ketchup
1 1/2 cups brown sugar
1/4 cup vinegar
1 tsp soy sauce
Mix together 2 tblsp cornstarch to 1 cup of water, and add to sauce. Cook until thick. Add cut up chicken and optional pineapple chunks, and cook until heated through.
Serve over rice, or eat alone.