Can you use teriyaki sauce unrefrigerated from last use?

No. Teriyaki sauce is a fermented sauce, which means that it is made with microorganisms that will continue to grow if the sauce is not refrigerated. This can cause the sauce to become spoiled, which can lead to food poisoning. Additionally, teriyaki sauce is made with soy sauce, which is also a fermented product that can spoil if not refrigerated. Therefore, it is important to refrigerate teriyaki sauce after opening, and to discard any that has been left out for more than two hours.