You should definitely ask them. I'm sure they would tell you - I think there is no secret. I'm more of a wrap kind of person, but if you ask me, I prefer using pork loin. My favorite way of making and eating a sandwich/wrap is when I'm camping. I take my favorite pan-
https://www.amazon.com/pie-iron-for-campfire-cooking/dp/B088H42W2L - a lot of fresh vegetables and fruits. I use the grill pan for the veggies and wraps, and the fruits are washed from home—the perfect menu for when you're outside. If you want your wrap or sandwich to be lighter, choose chicken instead of pork, and do not use any spreading.