Mirin
A low-alcohol sweet Japanese rice wine. It is essential in Japanese cooking and adds a sweet flavor to dishes, sauces, and glazes. It is also used to erase the smell of broiled fish. In dishes it is sometimes used instead of a sugar/soy sauce combo. It is often referred to as rice wine.
I use Mirin all the time. I take One Cup Soy Sauce, 1 cup Mirin and reduce, its what "eel sauce" is. the sweet, goopy sauce they put on sushi