Best way to eat them: seal your mouth round the top, make a tiny hole with your teeth, and suck the juice out. If you just bite them, juice can fly into your neighbour's face!
Yang's at the Wujiang Rd shop was excellent and fun. Line up to buy what you want, then take your ticket and line up to receive it at the other little window. Then, if you are eating in, find a seat. You may have to wait. Once seated, eat up and leave so the next person has a chance. This is not a place to linger, it's a place to suck down some dumplings and get back on the street.
It's very cheap. 24 dumplings was 36 kuai and that kept 4 of us more than happy. Yummy, fresh, full of soupy juice.
It's not 5 star, it's real. Enjoy it for what it is. I've given it 4 for atmosphere because it is pleasantly rowdy, not because it has white linen table cloths and jazz muzak (it doesn't).
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