http://www.food.com/recipe/restaurant-teriyaki-sauce-133751

1/4 C soy sauce
1 C water
1/2 t ground ginger
1/4 t garlic powder
4 T brown sugar
1 T honey
2 T cornstarch
1/4 C cold water

Mix all ingredients except cornstarch and 1/4 C water in a sauce pan and
begin heating.
Mix cornstarch and cold water in a cup and dissolve cornstarch.
Add cornstarch to sauce in pan and heat until it's desired thickness.
Add water to thin if it becomes too thick.