That is a yellow tomato.
Teriyaki sauce:
* soy sauce (about 1/2 cup)
* mirin (I'm out of mirin)
* rice vinegar (three tablespoons)
* 1/4 cup granulated sugar
* 1 level teaspoon corn starch
* garlic
* ginger
Heat to boil to thicken, paint on. Baste or repaint every ten or twenty minutes for one hour.
I used:
* sake instead of vinegar
* honey
* brown sugar
My chicken thighs were brined, overall fairly salty. Sauce tasted too salty, added sugar to correct.