This is a fantastic recipe I got from Martha Stewart Magazine. It is the perfect summer dish! If I don't have the ground chicken on hand, I use boneless, skinless chicken breast. I marinate the chicken in a greek marinade and grill till done. Then, I slice up the chicken and add to the pitas. Either way works great!
You can also omit the mint leaves if you don't have them on hand. The recipe is just as good without them. Also, I sometimes substitute tortillas for the pita if I don't have them.