I've eaten a lot of veggie burgers and I think Deville Dinebar has the best veggie burger of all time. It's made with mushrooms and includes a delicious sauce along with some kind of corn salsa.
The waiter was super nice and gave good advice on what to order.
They mix a decent gin and tonic.
The atmosphere isn't exactly my style, slightly on the tacky side, but they have lots of comfortable seating and it wasn't too loud.
NOTE: Burger is not vegan as there is parmesan in the patty.