On a more helpful note, David Chang did a series for PBS titled “Mind of a Chef”. In one episode, he makes that red Chinese BBQ dish you mention.
But he makes the red braising liquid from Hawaiian Punch, Starbust (Strawberry, I think) and strawberry Menthos. I’m sure there are some other ingredients, but it came out looking almost florescent red, just like the stuff you seek.
PBS is generally pretty good about having their shows online, but I don’t see much of Mind of a Chef there.