Inspired by the How Expensive post.
The various steam dumplings+siu mai are a given I reckon.
Or list your most favourite dishes.
First things that came for me are:
Steamed prawn rolls (Cheong fun),
Fried stuffed crab claw, sugarcane prawn
Fried taro dumpling,
Chicken feet is a must as you dont normally get it elsewhere. LOL