Have you tried adding just a touch of vinegar to a tough cut of meat?
No. I know folks use ,ike,Italian dressing to tenderize meat, but have never tried it. (Don’t care for Italian dressing). I’ve tried pineapple, and it worked OK, but not a great deal. (The pineapple taste was not really detectable when the meat was cooked, which is a good thing)
For some types of meat, sous vide with a touch vino is the way to go.