I will just concur with the numerous other reviews here praising the dumplings at Din Tai Fung. We especially enjoyed the pork dumplings with the soup. However, all the dumpling dishes we tried were delicious. Also especially good was their stir-fried pok-choy dish.
It was interesting to watch them prepare the dumplings. Included with the meat mixture with which they stuff the dumplings they add aspic, essentially good quality chicken (or duck) stock that congeals into a gelatin when chilled. The aspic melts and cooks together with the meat stuffing as the dumpling is steamed. This yields a very juicy dumpling with a flavorful pool of juices that make these little buns wonderfully delicous.
The one comment I will add about the restaurant is the unven service we experienced. On one ocassion the service was friendly and attentive. A second visit resulted in a less enjoyable service experience: very slow responses that were less than congenial.
If you own or manage Din Tai Fung (Xintiandi), register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.