I have had one plant based burger a few years ago that was genuinely delicious, tasted no different to a real one, in fact I would have said it was a brilliant meat one if no one had said. Thick and juicy, tasted like rump mince, it even had some kind of beetroot juice in so it looked pink inside, certainly better than a budget meat burger.
No idea what was inside it beyond the beetroot juice, I'm guessing a pretty hefty concoction of various things. Probably would rather that than a lab grown meat tbh.