01 - Whisk together olive oil, lemon juice, minced garlic, cumin, coriander, paprika, turmeric, cinnamon, cayenne pepper, salt, and black pepper in a large bowl until thoroughly combined.
02 - Add chicken thighs to the marinade, turning pieces to coat completely. Cover bowl and refrigerate for at least 1 hour, up to 12 hours for maximum flavor development.
03 - Preheat oven to 425°F or heat a grill pan over medium-high heat.
04 - Arrange marinated chicken on a foil-lined baking sheet or grill pan. Roast or grill for 18-20 minutes, turning once halfway through, until chicken reaches internal temperature of 165°F and develops slight char.
05 - Remove chicken from heat and let rest for 5 minutes to redistribute juices. Slice chicken thinly against the grain.
06 - Combine Greek yogurt or tahini with minced garlic, lemon juice, and salt. Whisk in water 1 tablespoon at a time until sauce reaches drizzling consistency.
07 - Warm pita breads briefly. Fill each with lettuce, tomatoes, cucumber, onion, and pickles. Add sliced chicken and drizzle generously with sauce. Roll or fold and serve immediately.