I went for the classic beef burger, whole wheat bun, fried onions, mushrooms, lettuce, and tomato. Some toppings are free, others like the fried onions and mushrooms, are extra. The burger was good, the mushrooms and onions were great. The whole wheat bun was a very good choice---extra flavorful. Service was friendly but a little scattered.
Bareburger on the Upper East Side is another member of the riot of build-your-own-burger joints that came out of the Great Recession. They offer a variety of standard burger configurations plus the opportunity to design your own. Their twist on the formula comes in the meats they offer, not just the usual beef/turkey/veggie patty but also buffalo and ostrich.