re: Hibachi fried rice

They add Japanese mustard, which is one of the brown sauces they used to put in the divided dipping things before they all just went to yum yum sauce. Watch them closely next time you go and ask them to squirt some on your plate. I have searched for the recipe with no luck. A little dab of Chinese mustard in the rice comes close.

ETA: this is at Hokkaido in Tuscaloosa
ETA one more: a recipe for Japanese mustard. https://bakeitwithlove.com/hibachi-mustard-sauce/?utm_campaign=yummly