Located near C11, you can eat at Sir Veza's at the few seats they have available or take it to go. They have breakfast burritos, meaty burritos and a vegetarian veggie burrito that can be made vegan if you ask them to leave the cheese off. You can also have rice bowls, chips, guac, queso, etc.
I have had the vegan veggie burrito twice now and it was consistently delicious. It has a lot of black beans so if you are sensitive to the effects of beans, just ask them to leave it off. Also in that burrito is rice, peppers, onions, corn and guac. Their salsas are prepackaged and both red and green are so delicious. They are considerably quick for food made to order so you can grab food in between flights.
The guacamole was delicious but I was not impressed with the chips. They did not have any seasoning or salt on them so they lacked flavor. I would definitely order the burrito again or a burrito bowl.