I didn't see any mini-burgers on Saturday afternoon. It doesn't sound like I missed a lot.
By the way, no-one mentioned the desserts. One of the choices is a creme brulee with berries on order. It's a bit 'non-rich' by my standard but it's tasty.
BA T5 GF food is pretty good, although I am a little disappointed they no longer offer risotto. If they just introduced some of the choices that Asian F lounges offer (e.g. spring rolls, steamed dim sums etc), that would be pretty right, I think!
QF F lounge food is the one that went down the tube lately in my opinion. They had much nicer food when they first opened.