Add all of the ingredients for the tzatziki sauce into your container and mix well. Remember when you're cutting up your cucumber that if you really love cucumbers, add more in! If you don't care for it too much, use less! Set this in the fridge for at least overnight.
You can really cut your chicken up any way you'd like. I liked it this way, because I thought it would be easier to build a gyro with, being the same shape of the eventual wrap.
The chicken goes into the bag, the air gets pressed out, then it all goes into the fridge (sitting in a bowl, or on a plate, in case the bag leaks!)
I just gave my grill pan a quick spritz with some non-stick spray, after it had preheated over medium heat, then I laid my strips out, and let them do their thing for about 5 minutes per side, flipping once.
While your chicken is cooking, set up your pita bread. Take a piece of aluminum foil, about 10 inches wide, by 12 inches wide. Fold in half, so that it is 5 inches wide by 12 inches long. Set your pita bread on top of your aluminum foil, in the center, then spoon out some tzatziki sauce and olive topping, followed by your tomatoes and chicken.
Once you have your chicken on, just wrap it up, over lapping your aluminum foil, securing it so that it stays put. These are so delicious and pretty easy to put together! Please try these, and take an instant vacation!