Couple of notes regarding the recipe.
The meat that she's using is most likely pork belly, instead of pork ribs, at least in English. I think the cuts are just named differently in Japan. "alcohol" is sake. Sake + mirin + soy sauce is an extremely common flavor profile in Japanese cooking.
As for the mysterious sauce, beats me. Could be anything, really. I'd eat it as is, there's plenty of flavor already in stuff already in the pan.