Tzatziki Sauce: Whisk all ingredients together and combine
1. Preheat a grill to medium high heat.
2. Split pita bread in half. Spray pita bread with cooking spray and quickly grill on both sides. Set aside.
3. Grill Burgers to desired doneness and remove from grill (about 6-8 minutes per side).
4. Burger Build: Spread Tzatziki sauce on one side of pita bread. On the other side, add Burger patty and top with lettuce, red onion, pepperoncini, cucumbers and tomato. Top with crumbled feta and put two sides together. Enjoy!