Step 1

Place the chicken in a resealable bag and pour the vinaigrette over it to coat. Press out the air and seal. Marinade the chicken for 1 hour or up to 24 hours in the refrigerator. (Chicken can be frozen at this point. Thaw completely before moving to step 2)

Step 2

Grill the chicken over a medium flame for 4-5 minutes. Flip the chicken over and continue cooking until cooked through, approximately an additional 6-7 minutes.

Step 3

Transfer the chicken to a platter and allow to rest for 5 minutes. Slice thinly across the grain.

Step 4

Spread 1/4 of the tzatziki sauce on one side of the pita. Repeat with remaining pita bread.

Step 5

Arrange the lettuce, chicken, onion, tomato and cucumber on the pita. Sprinkle with the feta cheese.

Step 6

Fold the pita around the filling and serve immediately.