Hawaiian Kikkoman Chicken

For the life of me I can't figure out why this recipe is Hawaiian.  It tastes more like oven barbequed chicken to me.  In fact, if you wish you may grill the chicken instead.
The cooking times are for bone-in chicken, so if you decide to use boneless remember to shorten the cooking times.  Also, the sauce may be used to marinate the chicken for around 6 hours beforehand.  (I would recommend this.)

Hawaiian Kikkoman Chicken

1 or 2 cut up chickens or 6-8 chicken breasts
1 c. ketchup
1/2 c. vinegar
1 c. brown sugar
6 Tbsp. soy sauce
1 tsp. prepared mustard
1 tsp. garlic salt

1. Place chicken in oblong pain or broiler pan.
2. Combine all ingredients besides chicken in a saucepan and stir over low heat until blended well.
3.  Pour sauce over chicken and bake at 350 for 45 minutes or until done. 

source:  Tara B.