I returned yet again to the Hong-Kong-style restaurant on Urumqi Road that 
I like.  I had sweet and sour shrimp with pineapple, one of the few dishes 
one can order in Shanghai and get de-shelled shrimp.  I liked the shrimp, 
deep-fried I think, but found the sauce too sweet for me.  As I trust this 
restaurant, I realize this was the final test: I've now concluded (from a 
number of samples) that main courses in Shanghai that are meant to have 
some sweetness are always too sweet for me.