I've had stuff from Pitt Cue truck which was pretty gorgeous but I think turning up to their place will involve a long wait which could be annoying.
Dukes in Haggerston is nice and you can book - also it's a big beer place with few dozen options, towards the American craft beer side. Beavertown is their sister brewery, now based in Hackney Wick but previously downstairs from Duke's, their 8 ball rye IPA is lovely!
I've read very mixed reviews of Red Dog.
Went to Meat Market in Covent Garden a couple of weeks ago and had one of their Dead Hippy burgers, which was very good, but it was their chilli fries that were superb.
Pitt Cue is worth a visit - if there's a queue (there wasn't when I went on a Saturday night this time last year) the White Horse pub is just opposite.