I work in a hospital during the week and I (very) occasionally have to avail myself of the trucked-in meals. The one thing in this factory-supplied, mini-cafe nightmare that I can count on for flavour, freshness and even nutrition is a pita wrap with hummus, romaine lettuce and shredded carrot. Inexplicably, the pita is always soft and fresh, the hummus tastes homemade and the raw veggies are crisp and abundant. Rather than tempt fate by becoming dependent on this pita-wrapped oasis in the desert of institutionally outsourced "food," I decided to try to duplicate it at home. Last week, I bought one and took it apart to reverse engineer it. More