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Don't be surprised if the menus change a bit from time to time, but there is a vegan option at each cart. Yesterday I had the Mediterranean Picnic from the DC Central Kitchen cart. This cart is part of Capital Carts, an extension of their job training program. The Med Picnic is a vegan po boy, with caponata in sandwich form (I had to look it up first; essentially an eggplant dish). There are vegan desserts, but I haven't had one. The rest of the menu can be found here (pdf).
On the Fly was the most versatile and offered several vegan options. When I went last week, they offered organic pasta. Basically, you could tell the fellow behind the counter how you liked it, but I think the special that day had salmon as part of the dish. The rest of the menu is almost unbelievable for a cart (pdf). I need to try them all. Very vegan friendly. At the On the Fly cart at 7th and F Streets, you can also get a Julia's vegan empanada. They also sell my favorite drink of all time, Knudsen's Boysenberry Spritzer.
The final cart is from Delle & Campbell (as in Folarin Campbell; he helped GMU reach the Final Four a few years ago). D & C offers a great old vegan standby, the falafel sandwich. Tight. It's really good. Kind of smokey and burned. To D & C: I don't know it that was planned, but whatever happened in the kitchen, keep doing that.
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