Bit of a walk, but Hing Lee (32 Curlew St, London SE1 2ND) is best imo
Not much of a walk from Bermondsey Square, at even a slow amble you could do it in 15-16 minutes I'd say.
Straight up TBR, r. into Queen Elizabeth St., l. into Curlew, and it's on the corner of Gainsford.
Or up TBR, r into Tooley, l into Three Oak Lane, r into Q. Elizabeth, l into Curlew.
I have to say, that IMO the food is consistently good there.
Crystal China is great (the hotpot is fantastic!) if good food is your only criteria. Hutong has great food as well and is more of an experience, given that it's on the 32nd floor of the Shard, but is very expensive (think £75+ a head, before drinks and service).