With a cake shop on the ground floor, head up to the bustling 2nd floor of this restaurant for Shānxī’s famous vinegar/noodle combo. If you're bewildered by the choices, go for the six-type taster (六中面套餐; liùzhōng miàntào cān; ¥35), otherwise choose pork noodles (排骨炝锅面； páigǔ qiàngguōmiàn; ¥16). It also does shāomài (烧麦; ¥12). No English menu, but there are pictures.
Aim for a window seat.