So, as far as the sources I found go, it seems there's Japanese teriyaki, which is a cooking technique, and there's teriyaki sauce, a pre-made sauce developed i

So, as far as the sources I found go, it seems there's Japanese teriyaki, which is a cooking technique, and there's teriyaki sauce, a pre-made sauce developed in the US by Kikkoman, and they are different things, still to this day. The sauce is also sold in Japan nowadays.