For Cucumber Sauce: Stir yogurt, cucumber, dill, 1 Tablespoon chopped onion and mint in a medium bowl. Cover with plastic wrap and refrigerate until ready to serve.
Turkey Burger
Preheat grill to MEDIUM-HIGH heat or GRILL ZONE (ORANGE).
Place turkey, feta cheese, 1/2 cup chopped onion, oregano, pepper and salt; form mixture into 4 burgers.
Grill burgers covered 5 minutes on each side, until juices run clear and meat is no longer pink.
Serve burgers in a pita pocket with Cucumber Sauce, lettuce and sliced tomato.