Combination - they sell falafels à la carte (pita, falafel, salad). The falafel itself was good - I hadn't had a proper falafel in a while, but it's far too pricey. We wanted to go to Mahmoun's (I believe) but didn't have time.
After that, I had to bid NY farewell and head home. Overall, I would rate the Shack Stack Burger as the highlight meal of the trip. The muenster and cheddar cheese-filled fried portobello mushroom was unexpected in so many good ways.