Mystery Pita Sandwich...

For the life of me, I cannot remember where I had this pita sandwich with hummus, mushrooms, and lettuce. At first glance, I thought maybe it was from Field of Greens, but they don't have picnic tables there. I'm usually really great at remembering the restaurant name when I see the photo in my phone, but this one has me stumped. I'm thinking this was a modified menu item, but that still doesn't solve the riddle of where I bought this. In 600+ posts, I don't think I've forgotten a restaurant name or recipe source!