1/2 c. soy sauce
1/2 c. salad oil
1/3 c. plus 1 tbsp. rice vinegar
3 tbsp. sugar
2 tsp. dry mustard powder
1 tsp. garlic powder
1 tsp. oriental sesame oil
1/2 tsp. dry ginger powder
Chicken breasts

Blend all ingredients together, except chicken) in large container. Marinate chicken breasts which have been deboned in marinade for at least 2 hours. Grill chicken on each side until done. Discard leftover marinade.