I’m sorry I can’t speak to the existence of mitten crab, but we ate lunch at Pop Kitchen on 1/20/19. What a wacky place (in a good way). Well, wacky to me, and fun. Fun interior, chairs that look like they came off the “Partridge Family” bus, transparent cones on stalks that cover your food, steam it on a timer, and then automatically raise up. We had razor clams and some delicious (expensive) scallops, as well a bit of dim sum. We had tofu skin roll that was steamed for quite a while, but when it was done, it was fantastic. What most people do is place a bowl of congee in the well underneath the steamer and let it collect seafood juices, then eat the congee with its collected flavors. Anyway, hard to describe and pretty unique for SFBA and a lot of fun, with an extremely helpful and nice owner. (That’s my “Check Please” wrap-up.)
That’s the place. I see in the other long thread that you, sck (I think so, anyway) wondered about whether the steamed seafood would be bland and rubbery. They set a timer depending on what’s under the steam hood, so it’s cooked properly. You are given a big box of condiments - soy, soy w/hot chilis, green onion, cilantro, hot chilis in oil, other things I can’t remember.