I was just about to mention Wimpy* as a small gem in the world of manky fast-food burgers! (Haven't we had this conversation before, Gav?
) In the pre-veggie days, a quarter pounder with cheese from Wimpy was a fine thing due to its brown bun (dare I say bap?) and Big Mac style sauce. Their spicy bean burgers were a fine thing too, although I haven't had one for years.
An honourable mention goes to Gourmet Burger Kitchen as well – awesome on the veggie front, and I also have a soft spot for a burger place similar to GBK I went to earlier this year – it may have been
this place but it seems the menu has changed. Can't remember whether the burgers were good or if it was just the company and the occasion, though.
However, the best burger I've had recently was a home-made one – I can't remember exactly what went into it but it was some combination of black beans, mushrooms, cashew nuts, spring onion and garlic, with a few breadcrumbs on the outside, if I remember correctly, and it was awesome.