What is motoyaki sauce?

"Motoyaki" is not a known sauce or culinary term. It's possible you're thinking of a similar term or have a slight misremembering.

Here are some possibilities:

* Miso-yaki sauce: This is a popular Japanese sauce used for grilling and broiling. It's a savory and sweet sauce made with miso paste, sugar, mirin (sweet rice wine), and sometimes sake (rice wine). It's often used for marinating or basting grilled fish, chicken, and vegetables.

* Teriyaki sauce: This is another popular Japanese sauce used for marinating and grilling. It's typically made with soy sauce, mirin, sugar, and sometimes sake. Teriyaki sauce is known for its glossy glaze and savory-sweet flavor.

* Yakitori sauce: This is a specific sauce used for yakitori, skewered grilled chicken. It's typically a sweet and savory sauce made with soy sauce, mirin, sugar, and sometimes sake.

If you can provide more context or details about the sauce, I might be able to help you identify it more accurately.